[submodule][202012] Update sonic-utilities

* a72e407 - (HEAD, origin/202012) [202012][fast-reboot] Remove FLEX_COUNTER_TABLE from config_db.json before reboot (sonic-net#1774) (19 hours ago) <Vaibhav Hemant Dixit>
* 205aff8 - (HEAD, origin/202012) [acl_loader]: add iptype match to the rules for dataplane acl (25 hours ago) <Guohan Lu>
* 8aa2226 - Add mock support for swsscommon classes (sonic-net#1780) (26 hours ago) <Qi Luo>
* d939cfb - [Show] Update the subcommands of Kdump. (sonic-net#1682) (3 days ago) <yozhao101>
* 6376b5c - [route_check] Filter out VNET routes (sonic-net#1612) (3 days ago) <Volodymyr Samotiy>
* ba1e457 - [show priority-group drop counters] Add user info output when user want to check PG counters and polling are disabled (sonic-net#1678) (2 weeks ago) <Andriy Yurkiv>
* 4e7707c - [minigraph] Donot enable PFC watchdog for MgmtTsToR (sonic-net#1734) (2 weeks ago) <Blueve>

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