Removing Flush REST Sessions from teardown.

Delete all sessions is now taken as part of every
Get/POST/PUT request. Due to this, Flush REST
Sessions keyword is not required.

Resolves openbmc/openbmc-test-automation#776

Change-Id: Ib2ff03b0e1aa4821c6404dd9de0bcf5d41e36c6e
Signed-off-by: Sweta Potthuri <spotthur@in.ibm.com>
3 files changed