Introduce vim modeline for python sources

Introduce vim modeline for python sources

Introduce vim modeline to python source files. This sets up the
vim editor to PEP-8 recommend editing style. The vim modeline added:
"# vim: set et ts=4 sw=4:"

'et' converts the tabs to spaces, 'ts' set the tabs indentation/tabstop
to 4 characters and 'sw' sets the shiftwidth to 4 characters.

Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>