[crm]: Add utility for CRM configuration (#187)

* [crm]: Add utility for CRM configuration

Signed-off-by: Volodymyr Samotiy <volodymyrs@mellanox.com>

* [crm]: Add utility for CRM configuration

* Change "show acl table" command in order to show complete table without passing table ID
* Rename "nexthop_group_object" resource to "nexthop_group"
* Change CRM polling interval represantation from minutes to seconds

Signed-off-by: Volodymyr Samotiy <volodymyrs@mellanox.com>

* [crm]: Add utility for CRM configuration

* Use subprocess instead of os.popen
* Fix incorrect output of ACL table info

Signed-off-by: Volodymyr Samotiy <volodymyrs@mellanox.com>