Fix deletion of HBAC Rules when there are SELinux user maps defined

When deleting an HBAC rule we need to ensure that an SELinux user
map isn't pointing at it. We need to take what is the cn of the HBAC
rule and see if that rule exists, then return the dn to that rule.

The search was not being done properly and wasn't enforcing uniqueness.
It could have returned partial matches as well (so tests for the
search test).

https://fedorahosted.org/freeipa/ticket/2269

tests/test_xmlrpc/test_selinuxusermap_plugin.py

@@ -36,6 +36,7 @@ host1 = u'testhost1.%s' % api.env.domain
 hostdn1 = DN(('fqdn',host1),('cn','computers'),('cn','accounts'),
          api.env.basedn)
 hbacrule1 = u'testhbacrule1'
+hbacrule2 = u'testhbacrule12'
 
 fuzzy_selinuxusermapdn = Fuzzy(
     'ipauniqueid=[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12},%s,%s' % (api.env.container_selinux, api.env.basedn)
@@ -51,6 +52,7 @@ class test_selinuxusermap(Declarative):
         ('user_del', [user1], {}),
         ('host_del', [host1], {}),
         ('hbacrule_del', [hbacrule1], {}),
+        ('hbacrule_del', [hbacrule2], {}),
     ]
 
     tests = [
@@ -310,6 +312,26 @@ class test_selinuxusermap(Declarative):
         ),
 
 
+        dict(
+            desc='Create HBAC rule %r' % hbacrule2,
+            command=(
+                'hbacrule_add', [hbacrule2], {}
+            ),
+            expected=dict(
+                value=hbacrule2,
+                summary=u'Added HBAC rule "%s"' % hbacrule2,
+                result=dict(
+                    cn=[hbacrule2],
+                    objectclass=objectclasses.hbacrule,
+                    ipauniqueid=[fuzzy_uuid],
+                    accessruletype=[u'allow'],
+                    ipaenabledflag=[u'TRUE'],
+                    dn=fuzzy_hbacruledn,
+                ),
+            ),
+        ),
+
+
         ###############
         # Fill out rule with members and/or pointers to HBAC rules
         dict(
@@ -542,6 +564,19 @@ class test_selinuxusermap(Declarative):
         ),
 
 
+        # This tests selinuxusermap-find --hbacrule=<foo> returns an
+        # exact match
+        dict(
+            desc='Try to delete similarly named HBAC rule %r' % hbacrule2,
+            command=('hbacrule_del', [hbacrule2], {}),
+            expected=dict(
+                result=dict(failed=u''),
+                value=hbacrule2,
+                summary=u'Deleted HBAC rule "%s"' % hbacrule2,
+            )
+        ),
+
+
         # Test clean up
         dict(
             desc='Delete %r' % rule1,