recommendationservice: fully freeze pip

Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>

src/recommendationservice/requirements.txt

@@ -1,5 +1,29 @@
-grpcio==1.0.0
-grpcio-tools==1.0.0
-googleapis-common-protos==1.5.3
-opencensus==0.1.5
-google-cloud-trace==0.19.0
+cachetools==2.1.0
+certifi==2018.4.16
+chardet==3.0.4
+enum34==1.1.6
+futures==3.2.0
+google-api-core==1.2.1
+google-api-python-client==1.7.4
+google-auth==1.5.0
+google-auth-httplib2==0.0.3
+google-cloud-core==0.28.1
+google-cloud-trace==0.19.0
+google-python-cloud-debugger==2.8
+googleapis-common-protos==1.5.3
+grpcio==1.13.0
+grpcio-tools==1.0.0
+httplib2==0.11.3
+idna==2.7
+opencensus==0.1.5
+protobuf==3.5.2.post1
+pyasn1==0.4.3
+pyasn1-modules==0.2.2
+pytz==2018.5
+PyYAML==3.13
+requests==2.19.1
+rsa==3.4.2
+six==1.11.0
+uritemplate==3.0.0
+urllib3==1.23
+virtualenv==16.0.0