Add version range for pip dependencies

This helps fix #CE-11.

In #CE-11, the latest docker-compose (1.10.x) will trigger error with
`from docker import Client` in python lib.

Also add version range for all other dependencies.

Change-Id: Ifcf021a353eb15956b0c484883964c061a1d5982
Signed-off-by: Baohua Yang <yangbaohua@gmail.com>

src/requirements.txt

@@ -1,6 +1,6 @@
 docker-compose>=1.7.0,<=1.9.0
-Flask>=0.11.0
-greenlet>=0.4.5
-gunicorn>=19.0.0
-pymongo>=3.2.0
-requests>=2.0.0
+Flask>=0.10.0,<=1.12.0
+greenlet>=0.4.5,<=0.4.12
+gunicorn>=19.0.0,<=19.6.0
+pymongo>=3.2.0,<=3.4.0
+requests>=2.0.0,<=2.13.0