rpc: respect API config in RPCClient.create_connection

When connecting rpcclient, get the default values of the `verbose`,
`fallback` and `delegate` options from API config rather than hard-code
them.

https://fedorahosted.org/freeipa/ticket/4739

Reviewed-By: David Kupka <dkupka@redhat.com>

client/ipa-client-install

@@ -2794,7 +2794,8 @@ def install(options, env, fstore, statestore):
         # Now, let's try to connect to the server's RPC interface
         connected = False
         try:
-            api.Backend.rpcclient.connect(nss_dir=tmp_db.secdir)
+            api.Backend.rpcclient.connect(delegate=False,
+                                          nss_dir=tmp_db.secdir)
             connected = True
             root_logger.debug("Try RPC connection")
             api.Backend.rpcclient.forward('ping')

ipalib/rpc.py

@@ -861,8 +861,14 @@ class RPCClient(Connectible):
 
         return session_url
 
-    def create_connection(self, ccache=None, verbose=0, fallback=True,
-                          delegate=False, nss_dir=None):
+    def create_connection(self, ccache=None, verbose=None, fallback=None,
+                          delegate=None, nss_dir=None):
+        if verbose is None:
+            verbose = self.api.env.verbose
+        if fallback is None:
+            fallback = self.api.env.fallback
+        if delegate is None:
+            delegate = self.api.env.delegate
         try:
             rpc_uri = self.env[self.env_rpc_uri_key]
             principal = get_principal()