Update service validator to use AuthType
Update service validator to use AuthType

Input from Gunnar Mills:
    AuthType = Session, which creates a session and uses that.
    Doing basic auth (the default) takes roughly twice as long
    per call using our webserver.

Change-Id: Iadd70858f2c5034c632e6d3916ec83963896226a
Signed-off-by: George Keishing <bef0a9ecac45fb57611777c8270153994e13fd2e@in.ibm.com>

openbmc/openbmc-test-automation,openbmc/openbmc-test-automation