Revert "Fix typo in writing vm-group hash to individual test definition."
Revert "Fix typo in writing vm-group hash to individual test definition."

Only target_group is supported in the NodeDIspatcher and other dispatcher processes.

This reverts commit 13e80fddfbd56140c8700a7c9670261005de0012.

Change-Id: I2cbc73c43270cfb6df69a682d1c8e2548805b854

Linaro/lava-server,Linaro/lava-server,Linaro/lava-server,Linaro/lava-server