Update and correct python 2.x dockerfile

[chrispoole643]

• Failed to build due to not cd'ing into python source directory
• Pull out version number
• Prevent Docker warnings due to comments within RUN commands
• Build with optimizations enabled

Signed-off-by: Chris Poole chrispoole@uk.ibm.com

[aborkar-ibm]

Hi Chris,

Thank you for pointing out the error in Dockerfile. I will test and make the required changes.

Regards, Amod