EC2 VPC EIP association handling fix - EUCA-10235

VPC Elastic/public IPs associated with a network interface that is
attached to an instance are now stopped when associating an an alternate
address. The owner for IPs is now displayed as 'eucalyptus' rather than
the system account number.

EUCA-10235
EC2 VPC assign public IP on EIP disassociation - EUCA-10238

VPC instances launched with a mapped public IP are now assigned a public
IP when an EIP is disassociated.

EUCA-10238
Merge remote-tracking branch 'origin/dev/sjones/EUCA-10238' into testing