Update git submodules

* Update docs/submodules/clover from branch 'master'
  - Merge "Extended snort rule add to allow content field"
  - Extended snort rule add to allow content field

    - Exposed the 'content' field in the GRPC server AddRules method
    - Allows the 'MALWARE-CNC User-Agent ASafaWeb Scan' signature
    in the community rules to be copied to local rules
    - Above ensures more deterministic alerts by snort each time
    the signature is hit
    - Added here to support the SDC configuration guide, which details
    how to add this scan rule via GRPC client script

    Change-Id: I6945c1e500075444134543bb9eb6003a03f1d5cc
    Signed-off-by: Eddie Arrage <eddie.arrage@huawei.com>

diff --git a/docs/submodules/clover b/docs/submodules/clover
index 2208c1d..658c99a 160000 (submodule)
--- a/docs/submodules/clover
+++ b/docs/submodules/clover
@@ -1 +1 @@
-Subproject commit 2208c1dbef93cb46e862bb7ce6b6d8e0a7541304
+Subproject commit 658c99a18bd138bc0d21cbf1216db99953d07b1f