ClientModeImpl: Attach WifiNetworkAgentSpecifier

This is needed for matching the specific network request with the
network agent created for servicing it.

Note: WifiNetworkAgentSpecifier will continue to match any generic
requests. So, we can always send the specifier. The requestorUid will be
-1 if there is no specific request active.

Bug: 113878056
Test: ./frameworks/opt/net/wifi/tests/wifitests/runtests.sh
Test: act.py -c wifi_manager.config -tb dut-name -tc WifiManagerTest
Change-Id: I0c8b4b3a552b7765069520f1fc57fa70c9ade8b7
3 files changed