Add code to print and check current functional image on the BMC
Add code to print and check current functional image on the BMC

Output:
.image_version:                                    2.9.0-dev-550-g271cfda64
.#(CDT) 2020/07/24 02:23:15.900599 -    0.188676 - Issuing: cat /etc/os-release
..functional_version:

Change-Id: Ia7a79570e64e34966a57582e3b042da883c84c66
Signed-off-by: George Keishing <bef0a9ecac45fb57611777c8270153994e13fd2e@in.ibm.com>

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