Move my_print_defaults to mariadb-server-core (Closes: #898367)

The command is needed to install/upgrade databases. It should therefore
reside in the server-core package, as that package is supposed to contain
all necessary tools to start and run the database (although manually,
there are no automation or service scripts included in server-core by
design).

Breaks+Replaces in the control file already exists since previous file
moves so they do not need to be re-created.

debian/mariadb-server-10.1.install

@@ -19,7 +19,6 @@ usr/bin/aria_ftdump
 usr/bin/aria_pack
 usr/bin/aria_read_log
 usr/bin/msql2mysql
-usr/bin/my_print_defaults
 usr/bin/myisam_ftdump
 usr/bin/myisamchk
 usr/bin/myisamlog
@@ -109,7 +108,6 @@ usr/share/man/man1/myisamchk.1
 usr/share/man/man1/myisam_ftdump.1
 usr/share/man/man1/myisamlog.1
 usr/share/man/man1/myisampack.1
-usr/share/man/man1/my_print_defaults.1
 usr/share/man/man1/mysqlbinlog.1
 usr/share/man/man1/mysql_convert_table_format.1
 usr/share/man/man1/mysqld_multi.1

debian/mariadb-server-core-10.1.install

 usr/bin/innochecksum
+usr/bin/my_print_defaults
 usr/bin/mysql_install_db
 usr/bin/mysql_upgrade
 usr/sbin/mysqld
 usr/share/man/man1/innochecksum.1
+usr/share/man/man1/my_print_defaults.1
 usr/share/man/man1/mysql_install_db.1
 usr/share/man/man1/mysql_upgrade.1
 usr/share/man/man8/mysqld.8