1. Change in max_vm_flows.
    a. calling nova_fixture.wait_till_vm_is_up() to make sure vm
       is up before pinging its interface.

2. Changes in rsyslog.
    a. using copy_file_to_server in place of fab_put_file_to_vm
       to copy files to compute nodes.
    b. if there is no collector less compute exit gracefully.

Change-Id: I514235b680ae3d3ec6d0f7713f698847f999ad75
Merge "1. Change in max_vm_flows.     a. calling nova_fixture.wait_till_vm_is_up() to make sure vm        is up before pinging its interface."