Add test for startPptp

The test verifies arguments used to start the daemon

Bug: 201660636
Test: atest VpnTest
Change-Id: I0854fbeaf1a3e3554c157fde227a7bfa187b1013
Merged-In: I0854fbeaf1a3e3554c157fde227a7bfa187b1013
(cherry picked from commit 522cea7d4eca8b0c80b78fa187e6b0f24e10994d)
Merged-In: I0854fbeaf1a3e3554c157fde227a7bfa187b1013
1 file changed