Update official build parameters for RHEL6
Update official build parameters for RHEL6

Moved to using Core-setup-Linux-ARM-BT definition The ARM in the name
is missleading and is only the default which can be overrridden. We
are using that definition because the normal linux definition builds a
bunch more stuff like other distro packages which we don't need for
RH6.

steveharter/core-setup,zamont/core-setup,wtgodbe/core-setup,MichaelSimons/core-setup,steveharter/core-setup,wtgodbe/core-setup,crummel/dotnet_core-setup,crummel/dotnet_core-setup,zamont/core-setup,rakeshsinghranchi/core-setup,ericstj/core-setup,weshaggard/core-setup,weshaggard/core-setup,chcosta/core-setup,weshaggard/core-setup,rakeshsinghranchi/core-setup,crummel/dotnet_core-setup,steveharter/core-setup,MichaelSimons/core-setup,steveharter/core-setup,steveharter/core-setup,steveharter/core-setup,chcosta/core-setup,weshaggard/core-setup,chcosta/core-setup,crummel/dotnet_core-setup,zamont/core-setup,wtgodbe/core-setup,rakeshsinghranchi/core-setup,rakeshsinghranchi/core-setup,MichaelSimons/core-setup,chcosta/core-setup,rakeshsinghranchi/core-setup,ericstj/core-setup,MichaelSimons/core-setup,wtgodbe/core-setup,ericstj/core-setup,ericstj/core-setup,chcosta/core-setup,crummel/dotnet_core-setup,zamont/core-setup,zamont/core-setup,weshaggard/core-setup,rakeshsinghranchi/core-setup,ericstj/core-setup,crummel/dotnet_core-setup,chcosta/core-setup,weshaggard/core-setup,zamont/core-setup,ericstj/core-setup,MichaelSimons/core-setup,wtgodbe/core-setup,MichaelSimons/core-setup,wtgodbe/core-setup