Enable Qemu test execution

This change addresses the following
  - user input SSH and HTTPS port
  - consolidate SSH connections in lib
  - fix obsolete codes
  - update README instructions

Resolves openbmc/openbmc-test-automation#41

Change-Id: I06dd132fb745ebbf035cb0fc583b46542448d126
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
14 files changed