chore: exclude namespace package file from coverage (#91)

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Synth log will be available here:
https://source.cloud.google.com/results/invocations/dccf2aa5-417a-444f-b348-db74e12651a1/targets

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Source-Link: googleapis/synthtool@f3c0488
Source-Link: googleapis/synthtool@a651c5f

Author: yoshi-automation

packages/google-cloud-datastore/.coveragerc

@@ -17,6 +17,8 @@
 # Generated by synthtool. DO NOT EDIT!
 [run]
 branch = True
+omit =
+  google/cloud/__init__.py
 
 [report]
 fail_under = 100
@@ -32,4 +34,5 @@ omit =
   */gapic/*.py
   */proto/*.py
   */core/*.py
-  */site-packages/*.py
+  */site-packages/*.py
+  google/cloud/__init__.py

packages/google-cloud-datastore/synth.metadata

@@ -19,7 +19,7 @@
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "d3997468c7ea6f96659993820ee2cc24b7ddc98b"
+        "sha": "f3c04883d6c43261ff13db1f52d03a283be06871"
       }
     }
   ],