Fix scale util test tool

Fix scale util test tool

Fixed karaf session readiness checking for features installation.
Fixed duplicate data directory deletion.
Changed restconf url according to rfc-8040.
Added authorization for HttpClient so we can send requests.
Added PATCH requests for creating simulated devices.
Added default controller-ip and controller-port in parameters.
Added mechanism to check that netconf topology via restconf is ready.

JIRA: NETCONF-798
Change-Id: Ice05ab77cd0f479c5cbfc307d0fdca9104f8843b
Signed-off-by: OleksandrZharov <[email protected]>
Signed-off-by: Ivan Hrasko <[email protected]>