Removed incompatible docker option --rm from robot qemu script

Change-Id: I80e2c80915be10705bb96616530a40e55f9847b7
Signed-off-by: Leonel Gonzalez <lgonzalez@us.ibm.com>
diff --git a/run-qemu-robot-test.sh b/run-qemu-robot-test.sh
index 2d0b186..d6e29a0 100755
--- a/run-qemu-robot-test.sh
+++ b/run-qemu-robot-test.sh
@@ -36,8 +36,7 @@
 
 # Start QEMU docker instance
 # root in docker required to open up the https/ssh ports
-obmc_qemu_docker=$(docker run --rm \
-                              --detach \
+obmc_qemu_docker=$(docker run --detach \
                               --user root \
                               --env HOME=${HOME} \
                               --env QEMU_RUN_TIMER=${QEMU_RUN_TIMER} \