replace ssh-keygen -m with a python equivalent

When running on latest released versions of Debian and RHEL/CentOS
we get Encryption failure with "ssh-keygen: illegal option -- m"

Fixes LP# 1102501

Change-Id: Ia54bf8f3e8d51c8baa09ba67d2e18ad214316989
NOTE: new dependency on pyasn1 python module
Clean up extended server output samples

The extended status extension was testing list instead of get and the
extended server attribute extension was misnaming its sample files.

This makes the names of the samples consistent.

Change-Id: I5b6f8d00c85d7817775c190b2a7645a47f8085db
DocImpact: The api sample site may need to be updated as well
Merge "replace ssh-keygen -m with a python equivalent"
Merge "Clean up extended server output samples"