HPCC-9012 Minimum version of python changed to 2.6

API calls used in pyembed are preset in >=2.6 and does not require
a minimum setting of 2.7.

Signed-off-by: Philip Schwartz <philip.schwartz@lexisnexis.com>
Merge pull request #4173 from pschwartz/HPCC-9012-move-to-min-py-2.6

HPCC-9012 Minimum version of python changed to 2.6

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>