changed docker-py commit to the signed off commit

Signed-off-by: Yuval Kohavi <yuval.kohavi@gmail.com>

Author: yuval-k

requirements.txt

@@ -1,9 +1,8 @@
 PyYAML==3.10
-git+https://github.com/uvgroovy/docker-py.git@bae787b7f5d4ddd5aacfd57f2aa498acbedd2832#egg=docker-py
+git+https://github.com/uvgroovy/docker-py.git@8028c988ce363345988bc23444f08e27394a7fb5#egg=docker-py
 dockerpty==0.3.2
 docopt==0.6.1
 requests==2.5.2
 six==1.7.3
 texttable==0.8.2
 websocket-client==0.11.0
-