Peruse existing disable_rollback in stack-update

This patch adds two switches to explicitly override
disable_rollback property of the stack on stack-update.
If none of these swithces is provided,
implicitly use value of disable_rollback of the stack to be updated,
for which a stack lookup is first performed.

Change-Id: I235198ec04bfb192fcbfa4e2e3e618b64c99d3df
Closes-Bug: #1324366