dep org.eclipse.equinox.common in pom
dep org.eclipse.equinox.common in pom

To run the mwe2 workflow in Xtext 2.8.0

Change-Id: I01e2b586e6b3149dead3c7da646e632ea510c377

LorenzoBettini/javamm,LorenzoBettini/javamm,LorenzoBettini/javamm