Modify SDC guide for snort/lb config change from CLI

Modify SDC guide for snort/lb config change from CLI

- Convert instructions on how to modify runtime config
of snort-ids and http-lb services using cloverctl rather than
using python gRPC client script
- Remove A-B validation from the SDC guide and from the config
guide index, as it was not updated from Fraser to Gambia
- Add a yaml to add icmp ids rule

Change-Id: I0c5391d9eac0130586d4ab25543a3d308c2ed558
Signed-off-by: earrage <eddie.arrage@huawei.com>