Passthrough-enable keystone.conf.

This permits passthrough settings to be applied to keystone.conf using
'keystone' as the key in the config.

Change-Id: If43f5786bdb56299d68d0d068177a45b1ff30286
blueprint: passthrough-config
Prevent tftp sysv init script from firing.

This is an equivalent fix to I01f34c6869b60432cff115e46246cd526ec12a62
for ironic; it disables any SysV startup script from launching
tftpd before xinetd can get a look-in.

Change-Id: I263aa756f80f7cbcbf5ca5ef5226136e9eab7ba1
Installing ssl-cert package as apache element requires it

The apache element fails because make-ssl-cert is required
but never installed.  This was never tested and yet has
been merged.  This is a CI/testing failure that should be
noted.

Change-Id: Iec001c20332efd61907f65744c2be1d98bf96a37
Closes-Bug: #1318761
Merge "Prevent tftp sysv init script from firing."
Merge "Passthrough-enable keystone.conf."
Merge "Installing ssl-cert package as apache element requires it"