Advance submodule sonic-utilities to 832ef9c4 (#14445)

Why I did it
832ef9c4 - Fix bug in GCU vlanintf_validator ([Bcm SAI] ugprade Broadcom SAI to version 3.3.5.4m-1 #2765) (5 minutes ago) [jingwenxie]
53f611b7 - Revert "Convert IPv6 addresses to lowercase in apply-patch (Add Pegatron project to branch 201807 #2299)" (Add note for running out of disk space in /var/lib/docker to README.md #2758) (20 hours ago) [jingwenxie]
79a21cef - Revert frr route check ([mlnx] fix url inconsistency in fw.mk #2761) (8 minutes ago) [StormLiangMS]
824680ed - Resolved rc!=0 problem by replacing fgrep with awk. Added ipv4 filtering to get only v4 peers in case of show ip bgp neighbors (Improve eeprom access reliability #2756) (30 hours ago) [saurabh17g]
10f31ea6 - Revert "Replace pickle by json (Add autoneg to 7170-Q59S20 #2636)" ([hostcfgd] Default value of fallthrough for authentication set to be False.  #2746) (7 days ago) [Mai Bui]
05fa7513 - Fix the show interface counters throwing exception on device with no external interfaces ([docker-platform-monitor]: Add smartmontools 6.6-1 #2703) (11 days ago) [abdosi]
f27dea0c - [route_check] remove check-frr_patch mock ([minigraph]: Mark both ERSPAN and ERSPANv6 as mirror ACL tables #2732) (11 days ago) [Stepan Blyshchak]
2d95529d - Revert "Update load minigraph to load backend acl (mlnx msn2010: default config_db.json generation with sonic-cfggen is not working #2236)" (swss stretch update broke restore_neighbors.py for neigh service #2735) (12 days ago) [Neetha John]
c869c970 - (master) Update the ref guide to reflect the vlan brief output ([teamd] update teamd docker to stretch and fix teamd_init failure #2731) (2 weeks ago) [Vivek]
76457141 - Fix fast-reboot DB migration ([teamd]: update teamd docker to stretch #2734) (2 weeks ago) [Aryeh Feigin]
f7f783bc - Enhance the logic to wait for all buffer tables to be removed in _clear_qos ([sfputil] Not able to read out values of voltage/temp/power on some cables  #2720) (2 weeks ago) [Stephen Sun]
e6179afa - Remove timer from FAST_REBOOT STATE_DB entry and use finalizer (Rollback kernel submodule update. #2621) (3 weeks ago) [Aryeh Feigin]
ff688323 - [route_check] fix IPv6 address handling ([docker pmon] install fancontrol & sensord #2722) (3 weeks ago) [Stepan Blyshchak]
7a604c51 - update fast-reboot ([201811][sairedis][swss] advance sub module head of sairedis and swss #2728) (3 weeks ago) [jhli-cisco]
9f83ace9 - [GCU] Add vlanintf-validator (Revert "[device/celestica] blacklist gpio_ich kernel module on haliburton" #2697) (3 weeks ago) [jingwenxie]
338d1c05 - Check SONiC dependencies before installation. ([sonic-slave]: Add iproute2 dependencies in stretch docker #2716) (3 weeks ago) [Liu Shilong]
64d2efd2 - Improve show acl commands ([sonic-utilities] update submodule #2667) (3 weeks ago) [bingwang-ms]
2ef5b31e - [GCU] Add PFC_WD RDMA validator ([sub module] advance sonic-utilities sub module for 201811 branch #2619) (3 weeks ago) [isabelmsft]
c7aa8416 - [show][muxcable] increase timeout for displaying HW_STATUS (Fixing get_transceiver_change_event #2712) (3 weeks ago) [vdahiya12]
2fc2b826 - YANG validation for ConfigDB Updates: MIRROR_SESSION use case ([mellanox] Update SDK to 4.3.0132 #2430) (3 weeks ago) [isabelmsft]
e16bdaae - Fix non-zero status exit on non secure boot system ([service] add warmboot finializer service #2715) (3 weeks ago) [kellyyeh]
90d70152 - [route_check] implement a check for FRR routes not marked offloaded (Feature to run an option platform specific script on the first boot #2531) (3 weeks ago) [Stepan Blyshchak]
c2bc150a - [warm/fast-reboot] Backup logs from tmpfs to disk during fast/warm shutdown ([swss]: update swss docker to stretch #2714) (3 weeks ago) [Vaibhav Hemant Dixit]
a015834d - [db_migrator] Add missing attribute 'weight' to route entries in APPL DB ([device/celestica] blacklist gpio_ich kernel module on seastone #2691) (4 weeks ago) [Vaibhav Hemant Dixit]
cd519aac - [ci] Fix pipeline issue caused by sonic-slave-* change. ([201803] Modify Debian apt repos to reflect changes made by maintainers #2709) (4 weeks ago) [Liu Shilong]
2680e6f3 - [dhcp_relay] Fix dhcp_relay restart error while add/del vlan ([thrift] add a patch to revert THRIFT-3650 #2688) (4 weeks ago) [Yaqiang Zhu]
How I did it
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