Do not link networks just because the passwords match

Networks should not be linked just because the passwords match
when config_only_link_same_credential_configurations is true.
This config actually means password matching should be an
extra requirement on top of gateway/bssid matching.

Bug: 172776379
Test: atest FrameworksWifiTests
Change-Id: Ia7792b0d6fa263018f36aeeec139e8c34303c9b8
3 files changed