feat(cmapi): MCOL-6006 Disable failover when shared storage not detected

add Base api client
add NodeController api client
fix ClusterController Api client
add NodeController in endpoints.py
add 2 new endpoints to dispatcher: cluster/check-shared-storage and node/check-shared-file
add check_shared_storage method into ClusterHandler class
add set_shared_storage to node_manipulation t
add reading shared_storage in failover/config.py
fix is_shared_storage method in failover/config.py
add check_shared_storage in NodeMonitor class
fix some minor styling

cmapi/cmapi_server/controllers/dispatcher.py

@@ -6,12 +6,13 @@ from cmapi_server.controllers.endpoints import (
     StatusController, ConfigController, BeginController, CommitController,
     RollbackController, StartController, ShutdownController,
     ExtentMapController, ClusterController, ApiKeyController,
-    LoggingConfigController, AppController, NodeProcessController
+    LoggingConfigController, AppController, NodeController,
+    NodeProcessController
 )
 
 from cmapi_server.controllers.s3dataload import S3DataLoadController
 
-_version = '0.4.0'
+_version = '0.4.0'  #TODO: MOVE to constants
 dispatcher = cherrypy.dispatch.RoutesDispatcher()
 
 
@@ -261,6 +262,26 @@ dispatcher.connect(
 )
 
 
+# /_version/node/check-shared-file/ (GET)
+dispatcher.connect(
+    name = 'node_check_shared_file',
+    route = f'/cmapi/{_version}/node/check-shared-file',
+    action = 'check_shared_file',
+    controller = NodeController(),
+    conditions = {'method': ['GET']}
+)
+
+
+# /_version/cluster/check-shared-storage/ (PUT)
+dispatcher.connect(
+    name = 'cluster_check_shared_storage',
+    route = f'/cmapi/{_version}/cluster/check-shared-storage',
+    action = 'check_shared_storage',
+    controller = ClusterController(),
+    conditions = {'method': ['PUT']}
+)
+
+
 def jsonify_error(status, message, traceback, version): \
     # pylint: disable=unused-argument
     """JSONify all CherryPy error responses (created by raising the