Improve MySQL sample database.yml to also read from DBUSER_MYSQL.
Improve MySQL sample database.yml to also read from DBUSER_MYSQL.

nblackburn87/calagator,bencornelis/calagator,iamBalaji/Calagator,CorainChicago/ActivateHub,VolunteerOdyssey/calagator,matthewkmayer/calagator,matthewkmayer/calagator,iamBalaji/Calagator,shawnacscott/calagator,oktober/calagator,kerrizor/calagator,L2-D2/calagator,matthewkmayer/calagator,jmcduffie32/calagator,alexbeeken/calagator.org,cp/calagator-1,oktober/calagator,Villag/dentonator,VolunteerOdyssey/calagator,reidab/calagator,bencornelis/calagator,shawnacscott/calagator,jmcduffie32/calagator,reidab/calagator,shawnacscott/calagator,matthewkmayer/calagator,Villag/dentonator,nblackburn87/calagator,Villag/dentonator,kerrizor/calagator,L2-D2/calagator,bencornelis/calagator,kerrizor/calagator,cp/calagator-1,reidab/calagator,VolunteerOdyssey/calagator,CorainChicago/ActivateHub,eeeeeean/windchimes,dudleysr/calagator-workspace,iamBalaji/Calagator,oktober/calagator,Eugator-Wranglers/calagator,L2-D2/calagator,jmcduffie32/calagator,eeeeeean/windchimes,shawnacscott/calagator,CorainChicago/ActivateHub,L2-D2/calagator,Eugator-Wranglers/calagator,CorainChicago/ActivateHub,jmcduffie32/calagator,reidab/calagator,iamBalaji/Calagator,bencornelis/calagator,alexbeeken/calagator.org,dudleysr/calagator-workspace,kerrizor/calagator,nblackburn87/calagator,oktober/calagator,cp/calagator-1,cp/calagator-1