Change client id for salt minion to use dc attr

We've change how the dc attribute is set in LDAP to be the
instance's fqdn, so we need to also set this attribute correctly
for the salt minion as well.

Change-Id: Iaf99adfedf1e9764403d46f0b4beae43a698fcc3
Merge "Change client id for salt minion to use dc attr" into production