multi node install pre-requisites script

Multi node installations are inherently complex and have a number of pre-requisites which are documented but need to performed and validated. The idea here would be to provide a script to be run prior installation and run on the pm1 node which checks for the basic problems that tend to trip people up:

• can ping the remote host
• software is in the right place on pm1
• can ssh as install user (and pwd or ssh key) on the remote host
• required os dependencies are in place
• can reach the required ports. (while we could check for firewall settings files i think it'd be better to have a general purpose solution for customers that want to have restrictive firewalls in place.

The script would need to take in a list of the remote hosts as arguments, User and software location can be inferred from current user.