Delete REST client active sessions in CI

During long boot test, the REST call to check on boot progress failed
where server failed to respond due to too many session opened. Refer
openbmc/openbmc#1389

Ran test with this fix and it pass the test now.

Resolves openbmc/openbmc-test-automation#464

Change-Id: I0a0e0929749f2698295ae5ece64de3ea05043210
Signed-off-by: George Keishing <gkeishin@in.ibm.com>
1 file changed