JCR-5224: remove jackrabbit 2.0 compatibility and performance tests (#331)

Author: reschke

test/compatibility/create20/pom.xml

@@ -41,7 +41,6 @@
   <modules>
     <module>parent</module>
     <module>base</module>
-    <module>create20</module>
     <module>create21</module>
     <module>create22</module>
     <module>create24</module>

test/compatibility/create20/src/test/java/org/apache/jackrabbit/harness/compatibility/CreateRepositoryTest.java

@@ -41,7 +41,6 @@
   <modules>
     <module>parent</module>
     <module>base</module>
-    <module>jackrabbit20</module>
     <module>jackrabbit21</module>
     <module>jackrabbit22</module>
     <module>jackrabbit23</module>