Free requests after processing them in cmd line tool
Free requests after processing them in cmd line tool

App installation and user management requests were not freed after their
processing is finished in security-manager-cmd. Pointers wrapped in
std::unique_ptr.

Change-Id: I689833dea78ccedb5aaac9267d3c0a06895f0568

Samsung/security-manager,Samsung/security-manager,Samsung/security-manager