Merge pull request #372 from euanh/spec-wrapper

Move Debian package mapping details out of pkg
Merge pull request #373 from euanh/spec-wrapper

specdep: argparse is not available on CentOS 6.4
Merge pull request #374 from euanh/spec-wrapper

planex: Add command line switch for 'dist'
Makefile: Use $(DIST) variable

Signed-off-by: Euan Harris <euan.harris@citrix.com>
pkg: Fix pylint warning

Signed-off-by: Euan Harris <euan.harris@citrix.com>