HP 3PAR configurable ssh-host-key-policy

Cinder added configurable SSH strict key policy (RejectPolicy)
and configurable known_hosts_file.  This patch configures the
hp3parclient (used by the 3PAR drivers) using those settings.

Change-Id: I71fa7d8be28d1cb7c0102590e03cba994b6035a0
Closes-bug: 1365697
Merge "HP 3PAR configurable ssh-host-key-policy"