Uses brew install python2

'brew install python' used to pull in python 2
Now is pulls in python 3
This commit explictly uses python 2

README.macOS.bash

@@ -28,11 +28,7 @@ brew install go # Or get the latest from https://golang.org/dl/
 brew install dep
 
 # Installing python libraries
-brew install python
-cat >> ~/.bash_profile << EOF
-export PATH=/usr/local/opt/python/libexec/bin:\$PATH
-EOF
-source ~/.bash_profile
+brew install python2
 pip install lockfile psi paramiko pysql psutil setuptools
 pip install unittest2 parse pexpect mock pyyaml
 pip install git+https://github.com/behave/behave@v1.2.4