DatabaseBackup.supported_depots: Use model names rather than prefixes
DatabaseBackup.supported_depots: Use model names rather than prefixes

The prefixes can be derived from the class using uri_prefix() routine.

NickLaMuro/manageiq,mzazrivec/manageiq,d-m-u/manageiq,skateman/manageiq,chessbyte/manageiq,mzazrivec/manageiq,d-m-u/manageiq,jvlcek/manageiq,NickLaMuro/manageiq,ManageIQ/manageiq,d-m-u/manageiq,jvlcek/manageiq,skateman/manageiq,ManageIQ/manageiq,agrare/manageiq,kbrock/manageiq,mzazrivec/manageiq,agrare/manageiq,kbrock/manageiq,jrafanie/manageiq,agrare/manageiq,kbrock/manageiq,jrafanie/manageiq,d-m-u/manageiq,agrare/manageiq,kbrock/manageiq,skateman/manageiq,mzazrivec/manageiq,chessbyte/manageiq,jrafanie/manageiq,ManageIQ/manageiq,chessbyte/manageiq,jvlcek/manageiq,chessbyte/manageiq,jvlcek/manageiq,ManageIQ/manageiq,jrafanie/manageiq,NickLaMuro/manageiq,NickLaMuro/manageiq,skateman/manageiq