Allow compound matching in eauth config expressions

When we try to match the configured expression, we look for a match type
(e.g. `I@`, `G@`, etc.) at the beginning, and when we don't find one we
were falling back to a glob. This changes the fallback to compound so
that we can support compound matches. Note that the compound matching
engine will act just like the glob match engine when the host passed to
it is a single minion ID glob, so using compound as the fallback gets
you glob matching for free.

salt/utils/minions.py

@@ -706,7 +706,7 @@ class CkMinions(object):
                'S': 'ipcidr',
                'E': 'pcre',
                'N': 'node',
-               None: 'glob'}
+               None: 'compound'}
 
         target_info = parse_target(auth_entry)
         if not target_info: