Nuke python 3 support from travis
Nuke python 3 support from travis

** there are many version incompatibiies between
   components including between protobuf c compilers
   and python 3
** remove travis support for python 3 for now

Signed-off-by: Abdullah Shah <0c8fc1cfda398f9e967f2cc681f82ed5570d4b5e@gmail.com>

tahir24434/hydra,tahir24434/hydra,lake-lerna/hydra,kratos7/hydra,sushilks/hydra,sushilks/hydra,lake-lerna/hydra,tahir24434/hydra,lake-lerna/hydra,sushilks/hydra,kratos7/hydra,kratos7/hydra