WifiNetworkConfigBuilder: Pass package name

Capture the package name (along with uid) of the app using the
builder for creating network specifiers & suggestions. We need
the exact package name to differentiate apps using shared UIDs.

Bug: 123078593
Test: ./frameworks/base/wifi/tests/runtests.sh
Test: act.py -c wifi_manager.config -tb dut-name -tc WifiNetworkRequestTest
Test: act.py -c wifi_manager.config -tb dut-name -tc
WifiNetworkSuggestionTest
Test: New CtsVerifier tests for network request.

Change-Id: Ib55d34b60219808ad30bf44db2a806e1c69ae2c5