FIX Site2SiteVPN on redundant VPC

[michaelandersen]

This PR:

• fixes starting of Site2Site VPN on redundant VPC
• fixes Site2Site VPN state checking on redundant VPC
• improves the vpc_vpn test to allow multple hypervisors
• adds an integration test for Site2Site VPN on redundant VPC

Build passed with no errors

Tested it on 4.7 single Xen server zone:

command:

nosetests --with-marvin --marvin-config=/data/shared/marvin/mct-zone1-xen1.cfg -a tags=advanced,required_hardware=true /tmp/test_vpc_vpn.py

results:

Test Site 2 Site VPN Across redundant VPCs ... === TestName: test_01_redundant_vpc_site2site_vpn | Status : SUCCESS ===
ok
Test Remote Access VPN in VPC ... === TestName: test_01_vpc_remote_access_vpn | Status : SUCCESS ===
ok
Test Site 2 Site VPN Across VPCs ... === TestName: test_01_vpc_site2site_vpn | Status : SUCCESS ===
ok

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Ran 3 tests in 1490.076s

OK

also performed numerous manual inspections of state of VPN connections and connectivity between VPC's