Reversed: Added reset to rally commit ID in prepare_env.sh
Reversed: Added reset to rally commit ID in prepare_env.sh

I did not realized it was correct, however there was a small bug.
The rally repo git reset command is done after the if-else clause.

Change-Id: Ia6f61ae3a3d09a5148cfbea7c47cf317fd949c11
Signed-off-by: jose.lausuch <a4ed9890ad7f6494ac84a749f29a4dc3449a1186@ericsson.com>

mywulin/functest,mywulin/functest,opnfv/functest,opnfv/functest