Style cleanup -- remove namespace qualification from function.

Change-Id: I721637c0add9b241ec8584e2d4bec25ce80608f3
Add virtual Connection::flush() method.

Also remove the QLocalSocket::flush() that was called after
each message in LocalSocketConnection.

Change-Id: Ic4639b441cb0c9afab11aa0197aa3e7c46694ae4
Merge topic 'flush-connection' into master

47671cd8 Add virtual Connection::flush() method.
04695e14 Style cleanup -- remove namespace qualification from function.