Sonic-utilities submodule update

4e132c1 [debug dump] Refactoring Modules and Unit Tests (sonic-net#1943)
b550c44 Add command reference for trap flow counters (sonic-net#1876)
67a267b [Reclaim buffer] [Mellanox] Db migrator support reclaiming reserved buffer for unused ports (sonic-net#1822)
30e4654 Add show command for BFD sessions (sonic-net#1942)
e63f47e [warm-reboot] Fix failures of warm reboot on disconnect of ssh session (sonic-net#1529)
c05845d Add trap flow counter support (sonic-net#1868)
ef82f00 [load_minigraph] Delay pfcwd start until the buffer templates are rendered (sonic-net#1937)
f5e5a56 [sonic-package-manager] support sonic-cli-gen and packages with YANG model (sonic-net#1650)
64777a4 generic_config_updater: Filename changed & VLAN validator added (sonic-net#1919)
1f8f6ab [config reload] Update command reference (sonic-net#1941)

Signed-off-by: Vivek Reddy Karri <vkarri@nvidia.com>