(Bug 50755) Remove MigrationJob/SMWMigrate

MigrationJob/SMWMigrate makes reference to SMWSQLStore2
which no longer exists in 1.9 therefore eliminate related classes.

* Remove MigrationJob class
* Remove SMWMigrate class

Change-Id: Ic507f33b86d858dca4e30b7463431e05e9f9e7c8