[utilities]: Update sonic-utilities submodule (#2289)

a099681 - [acl_loader]: Fix IP match bug for checking IP version (#387)
83ec276 - [show command] allow warm restart table contains empty restore_count (#385)
d0b8e3a - Log message during config load_minigraph/reload (#376)
e948d02 - Optimize warm-reboot speed on dumping and rebooting (#380)
1879fd0 - [warm reboot] unload kexec before rebooting and when error exiting from warm boot (#383)
e3e82b1 - [reboot] update stop syncd process wording (#382)

Signed-off-by: Shu0T1an ChenG <[email protected]>

Author: Shuotian Cheng