fix Tag#find_or_create_by_name
fix Tag#find_or_create_by_name

remove deprecation warning

```
DEPRECATION WARNING: This dynamic method is deprecated. Please use e.g. Post.find_or_create_by(name: 'foo') instead.
(called from block in add at app/models/tag.rb:14)
```

lpichler/manageiq,maas-ufcg/manageiq,NickLaMuro/manageiq,jntullo/manageiq,jvlcek/manageiq,maas-ufcg/manageiq,durandom/manageiq,hstastna/manageiq,yaacov/manageiq,andyvesel/manageiq,chessbyte/manageiq,mzazrivec/manageiq,kbrock/manageiq,ilackarms/manageiq,fbladilo/manageiq,yaacov/manageiq,NickLaMuro/manageiq,KevinLoiseau/manageiq,kbrock/manageiq,syncrou/manageiq,matobet/manageiq,jvlcek/manageiq,andyvesel/manageiq,durandom/manageiq,NaNi-Z/manageiq,djberg96/manageiq,kbrock/manageiq,billfitzgerald0120/manageiq,gmcculloug/manageiq,romaintb/manageiq,durandom/manageiq,ailisp/manageiq,branic/manageiq,lpichler/manageiq,syncrou/manageiq,djberg96/manageiq,mfeifer/manageiq,romanblanco/manageiq,romaintb/manageiq,branic/manageiq,tzumainn/manageiq,KevinLoiseau/manageiq,KevinLoiseau/manageiq,ailisp/manageiq,tzumainn/manageiq,d-m-u/manageiq,pkomanek/manageiq,andyvesel/manageiq,skateman/manageiq,gerikis/manageiq,matobet/manageiq,aufi/manageiq,gmcculloug/manageiq,lpichler/manageiq,romanblanco/manageiq,tinaafitz/manageiq,fbladilo/manageiq,maas-ufcg/manageiq,mresti/manageiq,mzazrivec/manageiq,tinaafitz/manageiq,tzumainn/manageiq,billfitzgerald0120/manageiq,romaintb/manageiq,gerikis/manageiq,djberg96/manageiq,ilackarms/manageiq,andyvesel/manageiq,syncrou/manageiq,fbladilo/manageiq,ilackarms/manageiq,gmcculloug/manageiq,israel-hdez/manageiq,josejulio/manageiq,aufi/manageiq,mfeifer/manageiq,hstastna/manageiq,ManageIQ/manageiq,NaNi-Z/manageiq,josejulio/manageiq,jrafanie/manageiq,hstastna/manageiq,chessbyte/manageiq,juliancheal/manageiq,syncrou/manageiq,ilackarms/manageiq,skateman/manageiq,pkomanek/manageiq,jameswnl/manageiq,pkomanek/manageiq,mresti/manageiq,jntullo/manageiq,romanblanco/manageiq,tinaafitz/manageiq,juliancheal/manageiq,matobet/manageiq,agrare/manageiq,juliancheal/manageiq,romanblanco/manageiq,skateman/manageiq,NickLaMuro/manageiq,jameswnl/manageiq,hstastna/manageiq,maas-ufcg/manageiq,yaacov/manageiq,jntullo/manageiq,djberg96/manageiq,maas-ufcg/manageiq,d-m-u/manageiq,skateman/manageiq,NaNi-Z/manageiq,mresti/manageiq,kbrock/manageiq,borod108/manageiq,agrare/manageiq,jrafanie/manageiq,chessbyte/manageiq,mresti/manageiq,aufi/manageiq,branic/manageiq,billfitzgerald0120/manageiq,maas-ufcg/manageiq,ailisp/manageiq,borod108/manageiq,mfeifer/manageiq,romaintb/manageiq,israel-hdez/manageiq,matobet/manageiq,mkanoor/manageiq,NickLaMuro/manageiq,jntullo/manageiq,lpichler/manageiq,d-m-u/manageiq,chessbyte/manageiq,josejulio/manageiq,KevinLoiseau/manageiq,mkanoor/manageiq,NaNi-Z/manageiq,ailisp/manageiq,mkanoor/manageiq,billfitzgerald0120/manageiq,romaintb/manageiq,jrafanie/manageiq,josejulio/manageiq,borod108/manageiq,tzumainn/manageiq,mzazrivec/manageiq,ManageIQ/manageiq,israel-hdez/manageiq,mfeifer/manageiq,jvlcek/manageiq,yaacov/manageiq,branic/manageiq,agrare/manageiq,fbladilo/manageiq,ManageIQ/manageiq,KevinLoiseau/manageiq,pkomanek/manageiq,ManageIQ/manageiq,d-m-u/manageiq,agrare/manageiq,borod108/manageiq,tinaafitz/manageiq,gmcculloug/manageiq,jameswnl/manageiq,mzazrivec/manageiq,israel-hdez/manageiq,gerikis/manageiq,jvlcek/manageiq,gerikis/manageiq,jrafanie/manageiq,juliancheal/manageiq,aufi/manageiq,durandom/manageiq,KevinLoiseau/manageiq,mkanoor/manageiq,romaintb/manageiq,jameswnl/manageiq