Fix is_service_runner to detect endpoints ending with /

----Release Notes----
[]
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=124576889

Author: aaltay

google/cloud/dataflow/utils/pipeline_options_validator.py

@@ -70,7 +70,7 @@ class PipelineOptionsValidator(object):
   JOB_PATTERN = '[a-z]([-a-z0-9]*[a-z0-9])?'
   PROJECT_ID_PATTERN = '[a-z][-a-z0-9:.]+[a-z0-9]'
   PROJECT_NUMBER_PATTERN = '[0-9]*'
-  ENDPOINT_PATTERN = r'https://[\S]*googleapis\.com'
+  ENDPOINT_PATTERN = r'https://[\S]*googleapis\.com[/]?'
 
   def __init__(self, options, runner):
     self.options = options

google/cloud/dataflow/utils/pipeline_options_validator_test.py

@@ -192,16 +192,31 @@ def test_is_service_runner(self):
             'options': ['--dataflow_endpoint=https://dataflow.googleapis.com'],
             'expected': False,
         },
+        {
+            'runner': MockRunners.OtherRunner(),
+            'options': ['--dataflow_endpoint=https://dataflow.googleapis.com/'],
+            'expected': False,
+        },
         {
             'runner': MockRunners.DataflowPipelineRunner(),
             'options': ['--dataflow_endpoint=https://another.service.com'],
             'expected': False,
         },
+        {
+            'runner': MockRunners.DataflowPipelineRunner(),
+            'options': ['--dataflow_endpoint=https://another.service.com/'],
+            'expected': False,
+        },
         {
             'runner': MockRunners.DataflowPipelineRunner(),
             'options': ['--dataflow_endpoint=https://dataflow.googleapis.com'],
             'expected': True,
         },
+        {
+            'runner': MockRunners.DataflowPipelineRunner(),
+            'options': ['--dataflow_endpoint=https://dataflow.googleapis.com/'],
+            'expected': True,
+        },
         {
             'runner': MockRunners.DataflowPipelineRunner(),
             'options': [],