Hi Folks,
Just my 2 cents on this…
In the past, with Openstack setups, I saw issue derived from the MTU and overlay encapsulation. Symptoms were similar to what you are observing
In your case [PING is working]
Ping from VCP to VFP (128.0.0.16 from __juniper_private1__ instance)
Try
ssh fromVCP to VFP (128.0.0.16 with user root)
If MTU in the int link is causing problems, SSH connection will have issues…something similar would happen for rpc which is the protocol used to download the process between the 2 VMs