In order for sss_cache to work correctly, we must also signal the autofs
responder to invalidate the hash table requests.

The monitor sends calls different sbus methods to different responders.
Instead of including headers of the particular responders directly in
monitor, which breaks layering a little, create a common header file
that will be included from src/responder/common/

https://fedorahosted.org/sssd/ticket/1592

When a request for auto.master comes in, we need to remove all the maps
from the lookup hash table. We can't simply delete the maps, because
another request might be processing them, so instead the maps are
removed from the hash table, effectively becoming orphaned. The maps
will get freed when the timed destructor is invoked.

There is a timed desctructor in the autofs responder that, when the
entry timeout passes, removes the autofs map from the hash table while
the map is freed. This patch adds a hash delete callback so that if the
map is removed from the hash table with hash_delete, its hash table
pointer will be invalidated. Later, when the entry is being freed, the
destructor won't attempt to remove it from the hash table.

https://fedorahosted.org/sssd/ticket/1495

 * Allows different user/domain qualified names for different
   domains. For example Domain\User or user@domain.
 * The global re_expression and full_name_format options remain
   as defaults for the domains.
 * Subdomains get the re_expression and full_name_format of
   their parent domain.

https://bugzilla.redhat.com/show_bug.cgi?id=811663

Also changes setautomntent_send so that is only return NULL in case the
tevent_req creation fails.

Now it checks for subdomains as well as for the domain itself