[VCN01] Add NOT_VCN_MANAGED capability

Add new capability to indicate whether a network is
managed by Virtual Carrier Network (VCN). This is needed
to identify networks between VCN managed network and
others. And this capability will be:
  1. mutable
  2. requestable
  3. set by default for network agents and requests
  4. allowed for test networks

Note that this commit is identical to aosp/1529959 except the
capability remains hidden to address the javadoc problem first.
And this CL also needs to be bound with the counter part change
to prevent build breakage.

Test: 1. atest FrameworksNetTests CtsNetTestCases
      2. adb shell dumpsys connectivity
      3. atest ConnectivityServiceTest#testLoseMutableAndRequestableCaps
Bug: 175662146

Change-Id: I37a6f492c2aba72836e36851b50b67398f8bdd36