chore(noAuth): changes as per new naming

Author: ehdsouza

README.md

@@ -36,7 +36,7 @@ authenticator = BasicAuthenticator(<your_username>, <your_password>)
 This indicates that IAM token authentication is to be used. Users can pass in a `apikey` and the SDK will generate a Bearer Auth header to send with requests to the service.
 
 ```py
-from ibm_cloud_sdk_core.authenticators import IamAuthenticator
+from ibm_cloud_sdk_core.authenticators import IAMAuthenticator
 
 authenticator = IAMAuthenticator(<your_apikey>)
 ```

ibm_cloud_sdk_core/authenticators/no_auth_authenticator.py

@@ -17,7 +17,7 @@
 from .authenticator import Authenticator
 
 class NoAuthAuthenticator(Authenticator):
-    authentication_type = 'noauth'
+    authentication_type = 'noAuth'
 
     def validate(self):
         pass

ibm_cloud_sdk_core/utils.py

@@ -172,7 +172,7 @@ def contruct_authenticator(config):
             client_id=config.get('client_id'),
             client_secret=config.get('client_secret'),
             disable_ssl_verification=config.get('auth_disable_ssl'))
-    elif auth_type == 'noauth':
+    elif auth_type == 'noAuth':
         authenticator = NoAuthAuthenticator()
 
     return authenticator

test/test_no_auth_authenticator.py

@@ -8,7 +8,7 @@
 def test_no_auth_authenticator():
     authenticator = NoAuthAuthenticator()
     assert authenticator is not None
-    assert authenticator.authentication_type == 'noauth'
+    assert authenticator.authentication_type == 'noAuth'
 
     authenticator.validate()