merge yshavit: Adding a mvn clean goal to the t3_regression script's mvn command.
merge yshavit: Adding a mvn clean goal to the t3_regression script's mvn command.

https://code.launchpad.net/~yshavit/akiban-server/t3_regressions_mvnclean/+merge/129181
relateiq/sql-layer,jaytaylor/sql-layer,relateiq/sql-layer,wfxiang08/sql-layer-1,shunwang/sql-layer-1,ngaut/sql-layer,shunwang/sql-layer-1,ngaut/sql-layer,jaytaylor/sql-layer,qiuyesuifeng/sql-layer,relateiq/sql-layer,shunwang/sql-layer-1,shunwang/sql-layer-1,wfxiang08/sql-layer-1,wfxiang08/sql-layer-1,qiuyesuifeng/sql-layer,jaytaylor/sql-layer,relateiq/sql-layer,ngaut/sql-layer,ngaut/sql-layer,qiuyesuifeng/sql-layer,qiuyesuifeng/sql-layer,jaytaylor/sql-layer,wfxiang08/sql-layer-1