Git commits in Moodle 3.4.1 by Matteo Scaramuccia

commit 8827e7fc3f6b9a5cd435dc68623d657888be08ad
Author: Matteo Scaramuccia <moodle@matteoscaramuccia.com>
Date:   Tue, 14 Nov 2017 07:24:29 +0800
Tag:    v3.4.1

MDL-60793 mod_chat: Renamed 'system' into 'issystem'

commit de703e70e76117bd4d91578c526249665e6e9b5e
Author: Matteo Scaramuccia <moodle@matteoscaramuccia.com>
Date:   Tue, 14 Nov 2017 06:26:08 +0800
Tag:    v3.4.1

MDL-60793 core_ddl: Added the new MySQL 8 reserved words

commit abe62e33e6657e48c766bcfc50610b528c7985da
Author: Matteo Scaramuccia <moodle@matteoscaramuccia.com>
Date:   Thu, 09 Nov 2017 06:02:24 +0800
Tag:    v3.4.1

MDL-60745 phpunit: Bump phpunit from 6.4.3 to 6.4.4

commit 740a9315c32d7240a7e64f695546a963d386b7df
Author: Matteo Scaramuccia <moodle@matteoscaramuccia.com>
Date:   Tue, 05 Sep 2017 05:12:47 +0800
Tag:    v3.4.1

MDL-59099 dml: MySQL8 supports only the Barracuda file format.