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
800373bdba