ASTERIXDB-1118: allow for lock conversion

Also improve debugability of ConcurrentLockManager and add new unit tests.

Change-Id: If49ed8d48fa8c71a52c880d4f42a2badbe6a57d7
Reviewed-on: https://asterix-gerrit.ics.uci.edu/474
Reviewed-by: Taewoo Kim <wangsaeu@gmail.com>
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
diff --git a/asterix-transactions/pom.xml b/asterix-transactions/pom.xml
index e5ad1b4..ae4aaa5 100644
--- a/asterix-transactions/pom.xml
+++ b/asterix-transactions/pom.xml
@@ -116,6 +116,6 @@
             <artifactId>mockito-all</artifactId>
             <version>1.10.19</version>
         </dependency>
-	</dependencies>
+    </dependencies>
 
 </project>