mysql: use mysqld in postinstall
mysql: use mysqld in postinstall

mysql_install_db has been deprecated and will be removed in a future release.
Per upstream:

```
The shell and Perl versions of mysql_install_db have been removed from MySQL distributions.
The executable C++ version of mysql_install_db implemented in MySQL 5.7.5 is still present,
but remains deprecated (use mysqld --initialize instead) and will be removed in
a future MySQL release. (Bug #21625471)
```

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aphy/homebrew,jeremiahyan/homebrew,MartinDelille/homebrew,tschoonj/homebrew,pdxdan/homebrew,nandub/homebrew,razamatan/homebrew,johanhammar/homebrew,ralic/homebrew,dalanmiller/homebrew,arnested/homebrew,bchatard/homebrew,mkrapp/homebrew,booi/homebrew,theeternalsw0rd/homebrew,jconley/homebrew,grepnull/homebrew,alex/homebrew,ExtremeMan/homebrew,scorphus/homebrew,MartinDelille/homebrew,dolfly/homebrew,kvs/homebrew,ehamberg/homebrew,ento/homebrew,yumitsu/homebrew,TaylorMonacelli/homebrew,cHoco/homebrew,johanhammar/homebrew,dericed/homebrew,petere/homebrew,emcrisostomo/homebrew,lvicentesanchez/homebrew,Gasol/homebrew,reelsense/linuxbrew,jarrettmeyer/homebrew,galaxy001/homebrew,dutchcoders/homebrew,jconley/homebrew,jedahan/homebrew,decors/homebrew,gawbul/homebrew,deorth/homebrew,sjackman/linuxbrew,yazuuchi/homebrew,alebcay/homebrew,DoomHammer/linuxbrew,yangj1e/homebrew,AlexejK/homebrew,geoff-codes/homebrew,LinusU/homebrew,adamliter/homebrew,base10/homebrew,frodeaa/homebrew,menivaitsi/homebrew,kodabb/homebrew,davydden/linuxbrew,knpwrs/homebrew,redpen-cc/homebrew,BrewTestBot/homebrew,mmizutani/homebrew,bukzor/linuxbrew,georgschoelly/homebrew,liamstask/homebrew,influxdb/homebrew,ear/homebrew,sferik/homebrew,cprecioso/homebrew,kodabb/homebrew,princeofdarkness76/homebrew,elgertam/homebrew,miketheman/homebrew,treyharris/homebrew,lvicentesanchez/linuxbrew,tutumcloud/homebrew,OJFord/homebrew,zchee/homebrew,georgschoelly/homebrew,Gasol/homebrew,Chilledheart/homebrew,saketkc/linuxbrew,redpen-cc/homebrew,iandennismiller/homebrew,BrewTestBot/homebrew,dickeyxxx/homebrew,dunn/homebrew,galaxy001/homebrew,dgageot/homebrew,benjaminfrank/homebrew,brunchboy/homebrew,quantumsteve/homebrew,koraktor/homebrew,getgauge/homebrew,dericed/homebrew,sjackman/linuxbrew,amjith/homebrew,moyogo/homebrew,dalanmiller/homebrew,pdpi/homebrew,drbenmorgan/linuxbrew,cchacin/homebrew,influxdb/homebrew,drewwells/homebrew,zhipeng-jia/homebrew,reelsense/linuxbrew,davidcelis/homebrew,codeout/homebrew,AGWA-forks/homebrew,thinker0/homebrew,bchatard/homebrew,slyphon/homebrew,Red54/homebrew,iostat/homebrew2,Linuxbrew/linuxbrew,gicmo/homebrew,LonnyGomes/homebrew,tsaeger/homebrew,Asuranceturix/homebrew,marcwebbie/homebrew,zchee/homebrew,xcezx/homebrew,knpwrs/homebrew,base10/homebrew,tschoonj/homebrew,elgertam/homebrew,influxdata/homebrew,vigo/homebrew,zeha/homebrew,SuperNEMO-DBD/cadfaelbrew,vigo/homebrew,getgauge/homebrew,LonnyGomes/homebrew,danieroux/homebrew,yazuuchi/homebrew,razamatan/homebrew,zchee/homebrew,jconley/homebrew,skinny-framework/homebrew,theeternalsw0rd/homebrew,kevinastone/homebrew,a-b/homebrew,josa42/homebrew,Asuranceturix/homebrew,Homebrew/linuxbrew,princeofdarkness76/homebrew,jab/homebrew,mobileoverlord/homebrew-1,miketheman/homebrew,arnested/homebrew,afh/homebrew,pcottle/homebrew,jamer/homebrew,yazuuchi/homebrew,esamson/homebrew,sakra/homebrew,kvs/homebrew,osimola/homebrew,alex/homebrew,cscetbon/homebrew,pcottle/homebrew,manphiz/homebrew,patrickmckenna/homebrew,scorphus/homebrew,lvicentesanchez/homebrew,jamer/homebrew,pcottle/homebrew,a-b/homebrew,ryanfb/homebrew,Habbie/homebrew,okuramasafumi/homebrew,osimola/homebrew,hanxue/homebrew,BrewTestBot/homebrew,optikfluffel/homebrew,hyuni/homebrew,Red54/homebrew,danabrand/linuxbrew,yangj1e/homebrew,frodeaa/homebrew,tjschuck/homebrew,getgauge/homebrew,tschoonj/homebrew,sakra/homebrew,skatsuta/homebrew,jconley/homebrew,sjackman/linuxbrew,filcab/homebrew,haihappen/homebrew,apjanke/homebrew,tstack/homebrew,okuramasafumi/homebrew,dongcarl/homebrew,galaxy001/homebrew,skinny-framework/homebrew,MoSal/homebrew,dongcarl/homebrew,cchacin/homebrew,jamer/homebrew,royhodgman/homebrew,TaylorMonacelli/homebrew,MartinDelille/homebrew,jab/homebrew,pdpi/homebrew,bukzor/linuxbrew,tjschuck/homebrew,pcottle/homebrew,keith/homebrew,codeout/homebrew,esamson/homebrew,influxdb/homebrew,SteveClement/homebrew,keith/homebrew,koraktor/homebrew,kodabb/homebrew,deorth/homebrew,Linuxbrew/linuxbrew,theeternalsw0rd/homebrew,skinny-framework/homebrew,cscetbon/homebrew,dickeyxxx/homebrew,zhipeng-jia/homebrew,booi/homebrew,dkotvan/homebrew,Homebrew/linuxbrew,dplarson/homebrew,totalvoidness/homebrew,chadcatlett/homebrew,michaKFromParis/homebrew-sparks,gicmo/homebrew,dolfly/homebrew,SteveClement/homebrew,mkrapp/homebrew,ralic/homebrew,quantumsteve/homebrew,chadcatlett/homebrew,kevinastone/homebrew,davidcelis/homebrew,yazuuchi/homebrew,skatsuta/homebrew,getgauge/homebrew,gvangool/homebrew,marcwebbie/homebrew,jmagnusson/homebrew,ryanfb/homebrew,patrickmckenna/homebrew,davidcelis/homebrew,ento/homebrew,MoSal/homebrew,jmagnusson/homebrew,coldeasy/homebrew,feelpp/homebrew,petere/homebrew,bukzor/linuxbrew,LonnyGomes/homebrew,geoff-codes/homebrew,recruit-tech/homebrew,treyharris/homebrew,filcab/homebrew,feelpp/homebrew,mactkg/homebrew,menivaitsi/homebrew,jsjohnst/homebrew,patrickmckenna/homebrew,keith/homebrew,max-horvath/homebrew,mobileoverlord/homebrew-1,cprecioso/homebrew,alebcay/homebrew,galaxy001/homebrew,kenips/homebrew,dkotvan/homebrew,bigbes/homebrew,tsaeger/homebrew,zeha/homebrew,deorth/homebrew,dkotvan/homebrew,hyuni/homebrew,felixonmars/homebrew,danieroux/homebrew,ebouaziz/linuxbrew,benjaminfrank/homebrew,dutchcoders/homebrew,ear/homebrew,quantumsteve/homebrew,cprecioso/homebrew,hyuni/homebrew,sferik/homebrew,bigbes/homebrew,drbenmorgan/linuxbrew,jedahan/homebrew,nelstrom/homebrew,chadcatlett/homebrew,pdpi/homebrew,vihangm/homebrew,base10/homebrew,mmizutani/homebrew,reelsense/homebrew,sakra/homebrew,hongkongkiwi/homebrew,codeout/homebrew,josa42/homebrew,megahall/homebrew,teslamint/homebrew,ryanfb/homebrew,jedahan/homebrew,teslamint/homebrew,recruit-tech/homebrew,koraktor/homebrew,ebouaziz/linuxbrew,Angeldude/linuxbrew,hongkongkiwi/homebrew,thinker0/homebrew,decors/homebrew,SteveClement/homebrew,apjanke/homebrew,manphiz/homebrew,LinusU/homebrew,okuramasafumi/homebrew,Chilledheart/homebrew,utzig/homebrew,sakra/homebrew,blogabe/homebrew,afh/homebrew,joshua-rutherford/homebrew,tstack/homebrew,felixonmars/homebrew,ilovezfs/homebrew,nandub/homebrew,jiashuw/homebrew,tstack/homebrew,marcusandre/homebrew,tutumcloud/homebrew,slyphon/homebrew,kevinastone/homebrew,retrography/homebrew,gnubila-france/linuxbrew,feelpp/homebrew,lmontrieux/homebrew,zeha/homebrew,elyscape/homebrew,geoff-codes/homebrew,Chilledheart/homebrew,scpeters/homebrew,hakamadare/homebrew,hanxue/homebrew,vigo/homebrew,Asuranceturix/homebrew,AGWA-forks/homebrew,yumitsu/homebrew,mmizutani/homebrew,drbenmorgan/linuxbrew,dickeyxxx/homebrew,manphiz/homebrew,a-b/homebrew,skatsuta/homebrew,nandub/homebrew,muellermartin/homebrew,afh/homebrew,cHoco/homebrew,gnawhleinad/homebrew,Linuxbrew/linuxbrew,thinker0/homebrew,utzig/homebrew,cchacin/homebrew,lvicentesanchez/homebrew,marcwebbie/homebrew,mactkg/homebrew,Gasol/homebrew,decors/homebrew,xcezx/homebrew,gicmo/homebrew,reelsense/homebrew,blogabe/homebrew,polishgeeks/homebrew,eighthave/homebrew,jarrettmeyer/homebrew,ear/homebrew,danabrand/linuxbrew,gnubila-france/linuxbrew,koraktor/homebrew,gnawhleinad/homebrew,jiashuw/homebrew,johanhammar/homebrew,ybott/homebrew,coldeasy/homebrew,ralic/homebrew,saketkc/linuxbrew,youtux/homebrew,hakamadare/homebrew,scpeters/homebrew,georgschoelly/homebrew,petere/homebrew,sometimesfood/homebrew,drewwells/homebrew,hakamadare/homebrew,kad/homebrew,ralic/homebrew,jab/homebrew,lrascao/homebrew,michaKFromParis/homebrew-sparks,danabrand/linuxbrew,ybott/homebrew,patrickmckenna/homebrew,utzig/homebrew,elgertam/homebrew,cscetbon/homebrew,frickler01/homebrew,kvs/homebrew,cosmo0920/homebrew,amjith/homebrew,megahall/homebrew,3van/homebrew,zchee/homebrew,marcusandre/homebrew,hyuni/homebrew,haihappen/homebrew,gnubila-france/linuxbrew,danieroux/homebrew,benjaminfrank/homebrew,petere/homebrew,nelstrom/homebrew,heinzf/homebrew,treyharris/homebrew,sjackman/linuxbrew,emcrisostomo/homebrew,dutchcoders/homebrew,sferik/homebrew,coldeasy/homebrew,sometimesfood/homebrew,kenips/homebrew,vihangm/homebrew,dalanmiller/homebrew,decors/homebrew,SuperNEMO-DBD/cadfaelbrew,sferik/homebrew,davidcelis/homebrew,grepnull/homebrew,max-horvath/homebrew,jmagnusson/homebrew,adamliter/homebrew,afh/homebrew,joshua-rutherford/homebrew,drewwells/homebrew,eighthave/homebrew,ge11232002/homebrew,dgageot/homebrew,Red54/homebrew,joshua-rutherford/homebrew,pdxdan/homebrew,heinzf/homebrew,reelsense/homebrew,ge11232002/homebrew,iandennismiller/homebrew,alebcay/homebrew,bigbes/homebrew,vihangm/homebrew,gvangool/homebrew,megahall/homebrew,Asuranceturix/homebrew,Homebrew/homebrew,yumitsu/homebrew,ablyler/homebrew,ExtremeMan/homebrew,DoomHammer/linuxbrew,dongcarl/homebrew,retrography/homebrew,slyphon/homebrew,royhodgman/homebrew,geoff-codes/homebrew,ybott/homebrew,influxdb/homebrew,ilovezfs/homebrew,jiashuw/homebrew,youtux/homebrew,scpeters/homebrew,slyphon/homebrew,dutchcoders/homebrew,iandennismiller/homebrew,kvs/homebrew,muellermartin/homebrew,manphiz/homebrew,codeout/homebrew,AlexejK/homebrew,dongcarl/homebrew,elyscape/homebrew,alebcay/homebrew,Angeldude/linuxbrew,ExtremeMan/homebrew,SteveClement/homebrew,thinker0/homebrew,felixonmars/homebrew,xyproto/homebrew,xyproto/homebrew,menivaitsi/homebrew,adamliter/homebrew,cchacin/homebrew,influxdata/homebrew,moyogo/homebrew,grepnull/homebrew,influxdata/homebrew,joshfriend/homebrew,dkotvan/homebrew,marcusandre/homebrew,iostat/homebrew2,hanxue/homebrew,lvicentesanchez/homebrew,esamson/homebrew,dolfly/homebrew,LonnyGomes/homebrew,dickeyxxx/homebrew,AlexejK/homebrew,hakamadare/homebrew,Homebrew/linuxbrew,brunchboy/homebrew,felixonmars/homebrew,gvangool/homebrew