debian install/upgrade fixes

1. don't run full mysql_upgrade on every server restart,
   use --version-check to do it only once

2. fix syslog tag name in the postinst script, don't pretend
   mysqld_safe generated all these messages. Auto-detect the version
   to simplify maintenance

debian/additions/debian-start

@@ -9,7 +9,7 @@ source /usr/share/mysql/debian-start.inc.sh
 
 MYSQL="/usr/bin/mysql --defaults-file=/etc/mysql/debian.cnf"
 MYADMIN="/usr/bin/mysqladmin --defaults-file=/etc/mysql/debian.cnf"
-MYUPGRADE="/usr/bin/mysql_upgrade --defaults-extra-file=/etc/mysql/debian.cnf"
+MYUPGRADE="/usr/bin/mysql_upgrade --defaults-extra-file=/etc/mysql/debian.cnf --version-check"
 MYCHECK="/usr/bin/mysqlcheck --defaults-file=/etc/mysql/debian.cnf"
 MYCHECK_SUBJECT="WARNING: mysqlcheck has found corrupt tables"
 MYCHECK_PARAMS="--all-databases --fast --silent"

debian/mariadb-server-10.1.postinst

@@ -2,13 +2,16 @@
 
 . /usr/share/debconf/confmodule
 
+# assume the filename is /path/to/mariadb-server-##.#.postinst
+VER=${0: -13:4}
+
 if [ -n "$DEBIAN_SCRIPT_DEBUG" ]; then set -v -x; DEBIAN_SCRIPT_TRACE=1; fi
 ${DEBIAN_SCRIPT_TRACE:+ echo "#42#DEBUG# RUNNING $0 $*" 1>&2 }
 
 export PATH=$PATH:/sbin:/usr/sbin:/bin:/usr/bin
 
 # This command can be used as pipe to syslog. With "-s" it also logs to stderr.
-ERR_LOGGER="logger -p daemon.err -t mysqld_safe -i"
+ERR_LOGGER="logger -p daemon.err -t mariadb-server-$VER.postinst -i"
 # This will make an error in a logged command immediately apparent by aborting
 # the install, rather than failing silently and leaving a broken install.
 set -o pipefail
@@ -131,7 +134,7 @@ EOF
     db_set mysql-server/postrm_remove_database false || true
 
     # To avoid downgrades.
-    touch $mysql_statedir/debian-10.1.flag
+    touch $mysql_statedir/debian-$VER.flag
 
     ## On every reconfiguration the maintenance user is recreated.
     #