remove -x from CI helper scripts (#582)

So that we don't print secrets in CI

ccm/delete_ccm_cluster.sh

@@ -6,6 +6,5 @@
 
 set -e
 set -o pipefail
-set -x
 
 http --ignore-stdin DELETE https://ccm.mesosphere.com/api/cluster/${CLUSTER_ID}/ Authorization:"Token ${CCM_AUTH_TOKEN}"

ccm/start_ccm_cluster.sh

@@ -6,7 +6,6 @@
 #   DCOS_CHANNEL
 
 set -e
-set -x
 
 # create cluster
 CLUSTER_ID=$(http --ignore-stdin \https://ccm.mesosphere.com/api/cluster/ \

ccm/tests_ccm_cluster.sh

@@ -2,7 +2,6 @@
 
 set -e
 set -o pipefail
-set -x
 
 # run tests
 CLI_TEST_MASTER_PROXY=true \

ccm/wait_for_ccm_cluster.sh

@@ -6,7 +6,6 @@
 
 set -e
 set -o pipefail
-set -x
 
 # wait for cluster to come up
 while true; do