Energy scale: test REST interface

Add REST utilities to the library and verify the
escale REST interfaces.

Resolves openbmc/openbmc-test-automation#1153
Change-Id: Id5d0f69862c1c62c5f320cb7199e60ff576f82d1
Signed-off-by: Steven Sombar <ssombar@us.ibm.com>
2 files changed