ISPyB LIMS: store sessions in 'session_manager' for user-type logins

On successful login using user-type logins, store returned sessions
in 'session_manger' attribute of the HWR.beamline.lims object.
This way session are avail later on.

mxcubecore/HardwareObjects/UserTypeISPyBLims.py

@@ -116,7 +116,11 @@ def login(self, loginID, psd, ldap_connection=None) -> LimsSessionManager:
             raise Exception("Error lims authentication")
 
         # login succeed, get proposal and sessions
-        self.adapter.get_sessions_by_username(loginID, self.beamline_name)
+        self.session_manager = self.adapter.get_sessions_by_username(
+            loginID, self.beamline_name
+        )
+
+        return self.session_manager
 
     def get_proposals_by_user(self, user_name):
         proposal_list = []