Add build files for RHEL7.

Signed-off-by: Dan Mick <dan.mick@inktank.com>
Switch requirements based on ${pyver} rather than $(FLAVOR)

The one real difference, importlib, depends on the Python version,
but we have that handy already in the shell snippet; use it.

Signed-off-by: Dan Mick <dan.mick@inktank.com>
Workarounds for salt bug https://github.com/saltstack/salt/pull/12316

Signed-off-by: Dan Mick <dan.mick@inktank.com>
Add a specialization of httpd conf for RHEL7/Apache 2.4's new auth directives

Also, make get-flavor.sh a bit more careful, and call 'rh' 'el6' to reflect
the fact that it's been used for both Centos and RHEL 6.x.  (rhel7 is still
named rhel7 simply because Centos 7 hasn't been validated.)  Make FLAVOR
apply to calamari.conf as well, even though it's of little use there.

Signed-off-by: Dan Mick <dan.mick@inktank.com>
Merge branch 'wip-rhel7' into 1.2

Conflicts:
	salt/local/postgres.sls