Align method signature of conflicting String[] and String.. declaration

Under JDK 1.8 this conflict causes unresolvable compiler warnings even in your own, derived classes not touching those methods at all.

 java: checkDatabaseChangeLogTable() in liquibase.database.AbstractJdbcDatabase
       implements checkDatabaseChangeLogTable(...,java.lang.String[]) in
       liquibase.database.Database; overridden method has no '...'