Integrate with Cynara, clients must be privileged

Integrate with Cynara, clients must be privileged

Several API functions now require the caller to hold appropriate privilege.
Ultimately new internal privileges will be created and used by security-manager.
For now, when appropriate privilege is missing, use "notexist" privilege
placeholder.

Privileges required per API:
- security_manager_app_install
  * http://tizen.org/privilege/notexist (private installation)
  * http://tizen.org/privilege/notexist (global installation)

- security_manager_app_uninstall
  * http://tizen.org/privilege/notexist (private uninstallation)
  * http://tizen.org/privilege/notexist (global uninstallation)

- security_manager_private_sharing_apply
  * http://tizen.org/privilege/notexist

- security_manager_private_sharing_drop
  * http://tizen.org/privilege/notexist

- security_manager_policy_update_send
  * http://tizen.org/privilege/notexist (for setting own policy)
  * http://tizen.org/privilege/internal/usermanagement (for setting policy for other or all)

- security_manager_get_configured_policy_for_admin
  * http://tizen.org/privilege/internal/usermanagement

- security_manager_get_configured_policy_for_self
  * http://tizen.org/privilege/notexist

- security_manager_get_policy
  * http://tizen.org/privilege/notexist (for fetching own policy)
  * http://tizen.org/privilege/internal/usermanagement (for fetching policy for other or all)

- security_manager_user_add
  * http://tizen.org/privilege/internal/usermanagement

- security_manager_user_delete
  * http://tizen.org/privilege/internal/usermanagement

Change-Id: Id67473db434b13d977fbd2fa704db3ac1bd1c32b
Signed-off-by: Rafal Krypa <r.krypa@samsung.com>