Update sonic-utilities submodule

8b149a3 Load the  database global_db only once for show cli  (#1712)
cd0e560 [config][interface][speed] Fixed the config interface speed in multiasic issue (#1739)
b595ba6 [fast-reboot] revert the change of disabling counter polling before fast-reboot (#1744)
8518820 [minigraph] Donot enable PFC watchdog for MgmtTsToR (#1734)
2213774 [CLI][show][bgp] Fix the show ip bgp network command (#1733)
3526507 [configlet] Python3 compatible syntax for extracting a key from the dict (#1721)
5b56b97 [sonic_installer] don't print errors when installing an image not supporting app ext (#1719)
a581955 [LLDP] Fix lldpshow script to enable display multiple MAC addresses on the same remote physical interface (#1657)