WifiConfigStore: read requirePMF config variable

When saving a wifi configuration, we set the requirePMF variable from
the config, but it is never read back.

Add the getNetworkVariable call for pmfVarName and add a call to verify
the attempt to read it back in the WifiConfigManagerTest.

Additionally fixed a checkstyle issue for unused imports.

BUG: 28088226
Change-Id: Ib7b2ba796e31ae57273c34b6845c218419125b72
2 files changed
tree: e92d376b189496dff11cf4ff669f35fe42149e86
  1. service/
  2. tests/