Updated sonic-utilities pointer

[warm/fast reboot] continue executing when killing docker failed (sonic-net#713)
[Ying Xie]
[neighbor_advertiser]: Add sleep in setting mirror session and ACL
rules(sonic-net#714)[Shuotian Cheng]
[config]: Flush the neighbor table when removing the router
interface(sonic-net#606) [Shuotian Cheng]
Add a generic configlet application script (sonic-net#716) [Renuka Manavalan]
Management vrf snmp cli support (sonic-net#472) [Harish Venkatraman]
show subinterfaces status (sonic-net#642) [Wenda Ni]
sonic-utilities: Add support for sFlow (sonic-net#592) [Garrick He]

Author: dgsudharsan