hadoop: Requires Java 1.7+
hadoop: Requires Java 1.7+

From the Hadoop 2.7.0 release notes:
This release drops support for JDK6 runtime and works with JDK 7+ only.

Closes #48823.

Signed-off-by: Dominyk Tiller <53e438f55903875d07efdd98a8aaf887e7208dd3@gmail.com>

esamson/homebrew,DoomHammer/linuxbrew,Homebrew/homebrew,kodabb/homebrew,bukzor/linuxbrew,retrography/homebrew,sometimesfood/homebrew,ralic/homebrew,reelsense/homebrew,gawbul/homebrew,hongkongkiwi/homebrew,OJFord/homebrew,drewwells/homebrew,drewwells/homebrew,getgauge/homebrew,ryanfb/homebrew,keith/homebrew,TaylorMonacelli/homebrew,menivaitsi/homebrew,royhodgman/homebrew,quantumsteve/homebrew,vigo/homebrew,TaylorMonacelli/homebrew,ralic/homebrew,afh/homebrew,apjanke/homebrew,hakamadare/homebrew,ExtremeMan/homebrew,benjaminfrank/homebrew,kevinastone/homebrew,galaxy001/homebrew,muellermartin/homebrew,mkrapp/homebrew,sjackman/linuxbrew,alebcay/homebrew,vigo/homebrew,ablyler/homebrew,retrography/homebrew,tschoonj/homebrew,nandub/homebrew,influxdb/homebrew,OJFord/homebrew,cscetbon/homebrew,nandub/homebrew,gnubila-france/linuxbrew,optikfluffel/homebrew,elyscape/homebrew,influxdata/homebrew,cprecioso/homebrew,totalvoidness/homebrew,menivaitsi/homebrew,liamstask/homebrew,ilovezfs/homebrew,dongcarl/homebrew,SteveClement/homebrew,AlexejK/homebrew,skinny-framework/homebrew,eighthave/homebrew,afh/homebrew,hanxue/homebrew,hongkongkiwi/homebrew,sakra/homebrew,decors/homebrew,Linuxbrew/linuxbrew,sjackman/linuxbrew,sferik/homebrew,thinker0/homebrew,Angeldude/linuxbrew,TaylorMonacelli/homebrew,yumitsu/homebrew,ear/homebrew,mobileoverlord/homebrew-1,osimola/homebrew,saketkc/linuxbrew,sakra/homebrew,bigbes/homebrew,youtux/homebrew,esamson/homebrew,drewwells/homebrew,iostat/homebrew2,treyharris/homebrew,ryanfb/homebrew,yazuuchi/homebrew,lrascao/homebrew,frodeaa/homebrew,dplarson/homebrew,benjaminfrank/homebrew,hakamadare/homebrew,OJFord/homebrew,Homebrew/linuxbrew,marcwebbie/homebrew,ilovezfs/homebrew,skinny-framework/homebrew,quantumsteve/homebrew,polishgeeks/homebrew,quantumsteve/homebrew,DoomHammer/linuxbrew,yazuuchi/homebrew,reelsense/linuxbrew,thinker0/homebrew,3van/homebrew,ilovezfs/homebrew,ryanfb/homebrew,Asuranceturix/homebrew,iostat/homebrew2,reelsense/linuxbrew,joshfriend/homebrew,SuperNEMO-DBD/cadfaelbrew,bukzor/linuxbrew,apjanke/homebrew,afh/homebrew,theeternalsw0rd/homebrew,cprecioso/homebrew,johanhammar/homebrew,thinker0/homebrew,drbenmorgan/linuxbrew,quantumsteve/homebrew,sferik/homebrew,theeternalsw0rd/homebrew,scpeters/homebrew,galaxy001/homebrew,michaKFromParis/homebrew-sparks,drbenmorgan/linuxbrew,getgauge/homebrew,kodabb/homebrew,Homebrew/homebrew,johanhammar/homebrew,jamer/homebrew,kevinastone/homebrew,scorphus/homebrew,liamstask/homebrew,menivaitsi/homebrew,marcwebbie/homebrew,Asuranceturix/homebrew,BrewTestBot/homebrew,filcab/homebrew,pcottle/homebrew,SteveClement/homebrew,Red54/homebrew,chadcatlett/homebrew,hanxue/homebrew,alebcay/homebrew,keith/homebrew,drewwells/homebrew,yumitsu/homebrew,ebouaziz/linuxbrew,tutumcloud/homebrew,elgertam/homebrew,elyscape/homebrew,Asuranceturix/homebrew,DoomHammer/linuxbrew,retrography/homebrew,cscetbon/homebrew,Linuxbrew/linuxbrew,dericed/homebrew,pcottle/homebrew,SteveClement/homebrew,michaKFromParis/homebrew-sparks,alebcay/homebrew,theeternalsw0rd/homebrew,joshfriend/homebrew,hanxue/homebrew,ear/homebrew,LinusU/homebrew,sometimesfood/homebrew,jamer/homebrew,elgertam/homebrew,slyphon/homebrew,alebcay/homebrew,youtux/homebrew,gnubila-france/linuxbrew,polishgeeks/homebrew,ablyler/homebrew,mobileoverlord/homebrew-1,ExtremeMan/homebrew,slyphon/homebrew,johanhammar/homebrew,bigbes/homebrew,josa42/homebrew,dutchcoders/homebrew,totalvoidness/homebrew,benjaminfrank/homebrew,polishgeeks/homebrew,scorphus/homebrew,liamstask/homebrew,base10/homebrew,sakra/homebrew,keith/homebrew,eighthave/homebrew,sjackman/linuxbrew,booi/homebrew,treyharris/homebrew,retrography/homebrew,SteveClement/homebrew,dickeyxxx/homebrew,youtux/homebrew,ryanfb/homebrew,kodabb/homebrew,influxdata/homebrew,saketkc/linuxbrew,utzig/homebrew,bigbes/homebrew,scpeters/homebrew,ralic/homebrew,scorphus/homebrew,ear/homebrew,liamstask/homebrew,thinker0/homebrew,filcab/homebrew,emcrisostomo/homebrew,theeternalsw0rd/homebrew,dongcarl/homebrew,skinny-framework/homebrew,reelsense/homebrew,Asuranceturix/homebrew,hakamadare/homebrew,bigbes/homebrew,saketkc/linuxbrew,drbenmorgan/linuxbrew,yazuuchi/homebrew,ExtremeMan/homebrew,treyharris/homebrew,influxdb/homebrew,Linuxbrew/linuxbrew,tutumcloud/homebrew,decors/homebrew,mkrapp/homebrew,sferik/homebrew,ExtremeMan/homebrew,kevinastone/homebrew,hanxue/homebrew,influxdata/homebrew,filcab/homebrew,mobileoverlord/homebrew-1,muellermartin/homebrew,AlexejK/homebrew,afh/homebrew,skinny-framework/homebrew,MartinDelille/homebrew,tschoonj/homebrew,dickeyxxx/homebrew,utzig/homebrew,deorth/homebrew,chadcatlett/homebrew,influxdb/homebrew,galaxy001/homebrew,brunchboy/homebrew,kodabb/homebrew,filcab/homebrew,3van/homebrew,Angeldude/linuxbrew,Red54/homebrew,brunchboy/homebrew,utzig/homebrew,brunchboy/homebrew,MartinDelille/homebrew,ablyler/homebrew,Homebrew/linuxbrew,pcottle/homebrew,ear/homebrew,scpeters/homebrew,muellermartin/homebrew,marcwebbie/homebrew,sakra/homebrew,slyphon/homebrew,reels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