Docker: Retire unused python libs. (#7378)

docker/build/installers/py27_conda.yml

@@ -3,7 +3,6 @@ dependencies:
   - python=2.7
   - numpy=1.8.2 # required by adu/ros-base
   - h5py=2.3.0 # latest version compatible with numpy 1.8.2; can also use 2.5.0 with pip
-  - pymongo
   - pip:
     - astropy==1.2.2 # anaconda says 0.4.1 is the latest version compatible with numpy 1.8.2, but not mature enough
     - glog

docker/build/installers/py27_requirements.txt

@@ -2,9 +2,6 @@
 #    sudo apt-get install python-numpy python-scipy python-matplotlib
 #    sudo pip install -r py27_requirements.txt
 
-# system utils
-supervisor
-
 # Google infras.
 glog
 protobuf == 3.1
@@ -13,12 +10,10 @@ python-gflags
 # Web utils.
 flask
 flask-cors
-gunicorn
 requests >= 2.18
 simplejson
 
 # Python tools
-pymongo
 pyproj == 1.9.6
 shapely