[202012][sonic-linkmgrd] submodule update

[zjswhhh]

[202012][sonic-linkmgrd] submodule update

commit efee4d5b807887bae14c16a8a297756739fcc17e (HEAD -> 202012, upstream/202012)
Author: Jing Zhang zhangjing@microsoft.com
Date: Mon Oct 3 09:40:55 2022 -0700

[Active-Standby] fix syslog flood caused by `unkown -> standby` switchovers  (#137)

Description of PR
Summary:
Fixes # (issue)

This is to fix the syslog flood issue caused by repeated switchovers from unknown to standby. The scenario trigged the issue was when xcvrd timed out toggles requests but was able to probe:
Linkmgrd toggles to standby
-> toggles fails, xcvrd writes unknown
-> linkmgrd probes mux state
-> xcvrd writes standby
-> linkmgrd toggles to standby (previous mux state was unknown, switching to match)
-> toggles fails, xcvrd writes unknown
-> ... ...

sign-off: Jing Zhang zhangjing@microsoft.com

commit d4de3d31db6512b045c050533cd9e11a92522916
Author: Jing Zhang zhangjing@microsoft.com
Date: Tue Sep 27 10:36:59 2022 -0700

[202012][Cherry-pick] Post switchover reasons to STATE DB (#138)

Description of PR
Summary:
Fixes # (issue)

Cherry-pick conflict:
ea68e8c Jing Zhang Wed Sep 21 10:52:18 2022 -0700 Post switchover reasons to STATE DB (#131)
a5a9f90 Hua Liu Fri Sep 16 09:54:32 2022 +0800 Install libyang to azure pipeline (#132)

sign-off: Jing Zhang zhangjing@microsoft.com

Why I did it

How I did it

How to verify it

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012
• 202106
• 202111
• 202205

Description for the changelog

Ensure to add label/tag for the feature raised. example - PR#2174 where, Generic Config and Update feature has been labelled as GCU.

Link to config_db schema for YANG module changes

A picture of a cute animal (not mandatory but encouraged)

[lguohan]

/azp run Azure.sonic-buildimage

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