Added support for MariaDB. To install MariaDB, add fai_db_vendor=mariadb
to ece-install.conf.
Make sure to use jar in java_home.
Make sure to use jar from java_home set in ece.conf.
Do not set jdbc_driver variable by default and made it possible to override
java_home by setting the environment variable JAVA_HOME.
Moved the location for the jdbc driver from tomcat/lib to
assemblytool/lib. It will now be located in {TOMCAT}/escenic/lib after
deploy.

ece-install will now use the mariadb jdbc driver if fai_db_vendor is set
to mariadb.
Merge branch 'master' of github.com:vizrt/ece-scripts