Amend build flags to install pip for python v2.7

[ajorpheus]

No description provided.

[ajorpheus]

This depends on #16 which should be reviewed and merged first.

[ajorpheus]

This depends on #16 which should be reviewed and merged first.

This has been merged.

[ajorpheus]

The Travis Build are failing due to the --enable-optimizations flag for python builds which triggers Profile Guided Optimizations (PGO) requiring the execution of all tests to generate profile data which is then used to optimize the compiled code (this results in a faster python executable being generated). However, the side effect of this is that the builds take much longer and hit the timeout limit that Travis CI has for a job.

For the change in build times look at this comment (and the conversation thread itself) : docker-library/python#160 (comment)

Travis CI build timeouts are documented here: https://docs.travis-ci.com/user/customizing-the-build/#build-timeouts

Given the above, I am going to merge this in.