package ubuntu: package name change to ubuntu's package name (#417)
package ubuntu: package name change to ubuntu's package name (#417)

Mroonga's package name is changed  by the following commit.
https://github.com/mroonga/mroonga/commit/6bd846f2136fd7c657f232212cfc4759f9dc7e59

However, Ubuntu's MySQL package is mariadb-server-10.x and mysql-server-5.x.
Therefore, we need to convert Mroonga's package name to Ubuntu's package name.
Otherwise, we can't get version for MySQL and MariaDB for Ubuntu.

mroonga/mroonga,mroonga/mroonga,mroonga/mroonga,mroonga/mroonga