Add *.pyc to gitignore.
Cause test environment to use private IP of instances.

Tests were failing because the database is not accessible
on the public IP (it is blocked by iptables).
Merge pull request #241 from blueboxgroup/private-ip-test

Cause test environment to use private IP of instances.
Perform iptables checksum filling on dhcp packets.

When running nova-compute on the same server as neutron-dhcp-agent,
DHCPACK packets were being dropped due to a bad UDP checksums, causing
networking to fail for VMs resident on that server.

This change configures iptables to perform UDP checksum filling on
DHCP packets, which causes the above symptom to disappear.
Merge pull request #242 from blueboxgroup/bootpc-checksum

Perform iptables checksum filling on dhcp packets.
Fix iptables-firewall syntax for filter table
Merge pull request #245 from blueboxgroup/fix-iptables

Fix iptables-firewall syntax for filter table
Include undercloud NAT rule in iptables