[sonic-utilities] Update submodule (#3173)

* ee56d54 2019-07-16 | [fast-reboot] Stop services after killing containers to prevent automatic restart (#572) (HEAD -> master, origin/master, origin/HEAD) [Joe LeVeque]
* c718cab 2019-07-17 | [acl_loader]: Fix show mirror_session error (#580) [JaredLius]
* 2764c6c 2019-07-16 | [Mellanox] Improve the prompt of the Mellanox sdk sniffer command. (#546) [Stephen Sun]
* 5a5b74d 2019-07-10 | Generate interface table to have an entry for default VRF (#525) [Prince Sunny]
* c30e9ff 2019-07-10 | [show] Don't abort in InterfaceAliasConverter ctor if PORT table doesn't exist (#571) [Joe LeVeque]
* 1aac696 2019-07-10 | [fast reboot] stop removing opennsl module before reboot (#560) [Ying Xie]
* 37823d4 2019-07-09 | Modified CLI doc for 201904 release, changed the config interface command, etc., (#561) [kannankvs]
* 77ae6b8 2019-07-03 | [PR template] Add reminder to update Command Line Reference Guide if modifying user-facing commands (#569) [Joe LeVeque]
* dc52015 2019-06-25 | [Sonic-utilities]: Added commands to view acl and port running configs (#557) [Prem Prakash]
* c7f45c3 2019-06-19 | [warm-reboot] Use retryCount option of orchagent_restart_check program (#555) [Jipan Yang]
* c6a08f7 2019-06-17 | [scripts]: add support to db_migrator for non-default unix socket (#551) [Lawrence Lee]
* 98e087f 2019-06-06 | [show]: Edit comment (#549) [Vasant Patil]
* 5667a90 2019-06-06 | [intfutil] Fix error when <interface name> specified in show interface related commands (#548) [Gord Chen]
* b7fcb1f 2019-06-04 | Add buffer pool watermark support in watermarkstat and counterpoll (#521) [Wenda Ni]
* 635dc88 2019-06-03 | [config]: Add config acl add/remove table command (#541) [Shuotian Cheng]
* dcdc922 2019-06-03 | [show]: Add show policer command (#540) [Shuotian Cheng]
* 82ef3ec 2019-06-01 | IP Address validation check (#530) [Tapash Das]
* 1f326ad 2019-05-31 | [show] Remove ability to clear counters from 'show' commands (#518) [Joe LeVeque]
* 669d36d 2019-06-01 | Add SONIC CLI Manual (#533) [kannankvs]
* 7657001 2019-06-01 | 'show vlan config' not displaying the VLAN members, after the clear config and reload with default l2 configuration. (#457) [RAMA CHANDRA REDDY GADDAM]
* 9493883 2019-05-28 | use vlan members (#542) [trzhang-msft]
* 128462a 2019-05-22 | [config]: Add --policer option for mirror session (#537) [Shuotian Cheng]
* 38da7f3 2019-05-22 | [acl_loader]: Add policer attribute in show mirror_session command (#538) [Shuotian Cheng]
* f95ff00 2019-05-22 | [acl_loader]: Do not apply default DENY rule for MIRRORV6 table (#522) [Shuotian Cheng]
* 50b7256 2019-05-21 | [sonic_installer] If asked to install an image which is already installed, simply set as default (#534) [Joe LeVeque]
* d823062 2019-05-20 | [201811] enable DB migrator code (#536) [Ying Xie]
* 7f7f384 2019-05-10 | update scheme variable name (#531) [trzhang-msft]
* c66315a 2019-05-10 | Config interface Loopback0 ip add/del is not working (#443) [Kiran Kumar Kella]
* 430d4b8 2019-05-10 | decode-syseeprom : added new option to show the Product Name. (#496) [Olivier Singla]