freeze requirements.txt for server tests (#2450)

server/tests-py/requirements-top-level.txt

@@ -0,0 +1,11 @@
+psycopg2-binary
+sqlalchemy
+pytest
+pytest-xdist
+requests
+pyyaml
+websocket-client
+pyjwt >= 1.5.3
+jsondiff
+cryptography
+graphene

server/tests-py/requirements.txt

@@ -1,11 +1,35 @@
-psycopg2-binary
-sqlalchemy
-pytest
-pytest-xdist
-requests
-pyyaml
-websocket-client
-pyjwt >= 1.5.3
-jsondiff
-cryptography
-graphene
+aniso8601==3.0.2
+apipkg==1.5
+asn1crypto==0.24.0
+atomicwrites==1.3.0
+attrs==19.1.0
+certifi==2019.3.9
+cffi==1.12.3
+chardet==3.0.4
+cryptography==2.7
+execnet==1.6.0
+graphene==2.1.3
+graphql-core==2.1
+graphql-relay==0.4.5
+idna==2.8
+importlib-metadata==0.17
+jsondiff==1.1.2
+more-itertools==7.0.0
+pluggy==0.12.0
+promise==2.2.1
+psycopg2-binary==2.8.2
+py==1.8.0
+pycparser==2.19
+PyJWT==1.7.1
+pytest==4.5.0
+pytest-forked==1.0.2
+pytest-xdist==1.28.0
+PyYAML==5.1
+requests==2.22.0
+Rx==1.6.1
+six==1.12.0
+SQLAlchemy==1.3.4
+urllib3==1.25.3
+wcwidth==0.1.7
+websocket-client==0.56.0
+zipp==0.5.1