Add ability to add sim-initiated MO call to UI (3/4)

Pipe an unknown call through CallsManager via various new APIs like
onSuccessfulUnknownCall, onFailedUnknownCall, etc. These are the unknown call's
equivalent of onSuccessfulOutgoingCall and onFailedOutgoingCall.

Only the TelephonyConnectionService is allowed to call this hidden new API
in Telecom.

Also add the ability for TestConnectionService to test this API (although the
check for TelephonyConnectionService must be disabled at build time first).

Bug: 16852844
Change-Id: I5dfdfc1bd4675f6b300a4a55a3098582f9d715a2
diff --git a/src/com/android/server/telecom/CreateConnectionProcessor.java b/src/com/android/server/telecom/CreateConnectionProcessor.java
index 6aae49b..0c6e25d 100644
--- a/src/com/android/server/telecom/CreateConnectionProcessor.java
+++ b/src/com/android/server/telecom/CreateConnectionProcessor.java
@@ -31,7 +31,7 @@
 import java.util.Objects;
 
 /**
- * This class creates connections to place new outgoing calls to attached to an existing incoming
+ * This class creates connections to place new outgoing calls or to attach to an existing incoming
  * call. In either case, this class cycles through a set of connection services until:
  *   - a connection service returns a newly created connection in which case the call is displayed
  *     to the user