Discount disconnected network when check interface

Context for fixing cts:
0. condition: MAX reached(FWK sees 1 in connected state, CF sees 11)
1. FWK deactivates the only one it sees(cid 1), so the slot become available for next setup request. Theoretically at this point since there is no network from FWK POV, next setup request can't be silently tear down due to existing network since there is none.
However, in this failed case, the next setup request encounters the disconnected network and got silently torn down, silently filling the last slot. Since no network exist from FWK POV, no deactivate request will be ever sent since.

Test: phone call + data browsing
Test: cts https://android-build.googleplex.com/builds/abtd/run/L92100000962635607 passed on cf_x86_64_phone-trunk_staging-userdebug but still fail on cf_x86_64_phone-userdebug for a different CF reason
Test: daily test b/296088621
Bug: 286586235
Change-Id: Ib8b99f5f9155aa5b29618b5f8c50a6a88b5f3303
Merged-In: Ib8b99f5f9155aa5b29618b5f8c50a6a88b5f3303