New var_funcs.py file.
New var_funcs.py file.

This file contains variable manipulation functions like
create_var_dict, join_dict and split_to_dict.

Change-Id: I14e21e1f91c3a5a5ea6929eaec2a1d88ae38e583
Signed-off-by: Michael Walsh <10404802c7de463f402c4a18638106ca1b12ef61@us.ibm.com>

openbmc/openbmc-test-automation,openbmc/openbmc-test-automation