Test that VpnManager events will never be sent to Settings VPNs

This change tries to mock there is an IkeTimeoutException when
Settings VPN is establishing connection and see if the VpnManager
events will be sent to Settings VPN or not.

Bug: 236315805
Test: atest FrameworksNetTests:VpnTest
Change-Id: I1706ceb129ef95f44d45754665b9dbcf9b6fdfd4
Merged-In: I1706ceb129ef95f44d45754665b9dbcf9b6fdfd4
Merged-In: I0ee4a70ded4937a1573d34cddab552f762e4fc18
(cherry picked from commit dbbeb9937076fe6b6a7167a6e9e6bc1ad1ff5a76)
Merged-In: I1706ceb129ef95f44d45754665b9dbcf9b6fdfd4
1 file changed