Fix HostsideVpnTests flakyness

VpnTest#checkTrafficOnVpn tests whether IP address is on VPN by
sending udp packet, ping and tcp packet to the address.
In aosp/1941233 the order of checks was changed from udp, ping, tcp
to udp, tcp, ping, which caused flaky behavior of the method.

This CL restores the order of checks as it was prior to aosp/1941233.

Bug: 214558556
Bug: 215903863
Bug: 214398658
Test: atest HostsideVpnTests --iterations 50
Change-Id: I5dc3c217b78746d5e8c13b80e5295eb6ffe5b778
1 file changed