CLOUDSTACK-1142: Refactor handleRequest definition, clean redundant code

- Get rid of boolean decode arg
- Method assumes that OTW params have been already decoded
- Remove redundant code that tries to decode again based on boolean arg

Signed-off-by: Rohit Yadav <bhaisaab@apache.org>
(cherry picked from commit 2b267c1ceb898564bbf60bec161739bc8ae6f6d9)

Signed-off-by: Rohit Yadav <bhaisaab@apache.org>