Vpnprofilestore: Set sqlite busy hander to None.

Set the busy handler to None, because it is unlikely that a transaction
lock can be successfully taken while busy wating in the sqlite librarly.

Also add a vpn database stress test.

Bug: 184006658
Test: atest vpnprofilestore_test
Change-Id: Ia18d5e86683cde908444f6257949497fdd2872e4
1 file changed