Wait for the image to be active before using, fixes failures when in parallel run

Change-Id: If6086621b92f1e075f8c0b58ce17da327c5f5a24
add test-infra for router add/delete/assoc/disassoc basic operations
add a basic router testcase

Change-Id: I5f00bbde01a1921e56f49835f08a72c69029e03a
Run through autopep8 for the the modified fixture files

Change-Id: Ice8ac166e1ec72705d569bdd30b954624bf8384e
Merge pull request #14 from vedujoshi/test_parallelism

Add test-infra for router add/delete/assoc/disassoc basic operations, add a basic router testcase, autopep8 changes