Fix for sshd taking too long problem

Fix for sshd taking too long problem

Under certain conditions, it takes longer than 10 seconds
on the cloudify manager VM from the time its IP stack becoming
ready (echoing to ICMP) to the time its sshd becoming ready.
This causes the ssh-into-cloudify-manager-VM command to fail.
The implemented solution is to replace the ping test-wait loop with
a TCP port 22 open test-wait loop.

Issue-Id: DCAEGEN2-201
Change-Id: I9b734a9ff58ec9e97dc0102dc2ba86756e50f135
Signed-off-by: Lusheng Ji <lji@research.att.com>