API: host-deploy: Adding ssh username, port and fingerprint to host information

Those additional fields are used to authenticate with the host during
deploy process. Currently we use default port (22) and root user to
connect to host. This patch adds the capability to use configurable
port and specific user
values, and avoiding using root password to install or update new host.

Change-Id: I6b8c117d041c29780af2468888a732ee664d283c
Signed-off-by: Yaniv Bronhaim <ybronhei@redhat.com>