Adjust pip versions for CentOS 7
Adjust pip versions for CentOS 7

Also should fix a build problem with pyOpenSSL 0.12 on Ubuntu getting
an undefined symbol "SSLv2_method" error.

MarshallBrinn/geni-ch,MarshallBrinn/geni-ch,tcmitchell/geni-ch,tcmitchell/geni-ch