Openstack Client and Validation Shell is hitting a regression
due to set_argument_parser calling directly parse_known_args
from argparse.
This patch fix the regression and avoid the need to call
parse_known_args directly.
Closes-Bug: #1949596
Change-Id: Ic9a682e7c3d5431e8779064947bd379c00aba584
Introduce validation config file.
The config default location of the config file will be stored
in /etc/validation.cfg
The variables precedence will be the following:
* user's cli args
* config file
* default interval values
Change-Id: I05c54a43bc0a03878793cca3f51e23f4a8b63a23