Update VPN capabilities when its underlying network set is null.

Previously, they were only updated when underlying network set was
non-null.

This change also ensures that all the calls b/w ConnectivityService and
Vpn that leads to updating capabilities are on ConnectivityService
handler thread.

Additionally, it also ensures that capabilities are propagated after VPN
enters connected state.

This change also updates VPN capabilities inline from
ConnectivityService handler thread. Previously, there was an additional
loop where Vpn would update capabilities via NetworkAgent thru
AsyncChannel which posts back to CS handler thread, which could
potentially lead to delays in updating VPN capabilities.

Bug: 119129310
Bug: 118856062
Bug: 124268198
Test: atest FrameworksNetTests
Test: manual - verified VPNs capabilities are getting updated and
DownloadManager is working correctly.

(cherry picked from commit 4fa80e8a)

Change-Id: Iae5f2024b19df04c31938815b52687781d016cde
Merged-In: Id0abc4d304bb096e92479a118168690ccce634ed