[Provisioner] Added ansible_ssh_private_key_file var.

[mwardRH]

Adding in this into extra vars options lets them user set the variable. I ran into an issue where the provisioner would provision the instances using my ec2_key_name pem file but would fail when trying to connect post provision to gather facts. I had to point to the directory of my ansible_ssh_private_key_file to the correct file using the full file path. Now it provisions correctly.

[liquidat]

@mwardRH Just to understand the issue - did this happen when your key was in $HOME/.ssh? Or does the issue by chance only happens when the key is not in $HOME/.ssh?

[tima]

@mwardRH: This is waiting on your response to @liquidat.

[gundalow]

@mwardRH Just reviewing old PRs, could you reply to

Just to understand the issue - did this happen when your key was in $HOME/.ssh? Or does the issue by chance only happens when the key is not in $HOME/.ssh?