p2p: support joining a group with a configuration

If network name and passphrase are specified in the
configuration, pass them to supplicant and try to
reinvoke the group whose SSID matched the network name.

Bug: 64695709
Test: manual test
      * create a group with configuration.
      * join above group by reinvoking a group.
Test: Unit tests - atest frameworks/opt/net/wifi/tests/wifitests

Change-Id: I833f544e1eadd43e38f938c4ec0a7fab5d285bbb
1 file changed