Jenkins: Skip a flaky test on Trusty release job

The monitoring test, i.e., "Monitoring should verify monitoring pods and all
cluster nodes are available on influxdb using heapster" has been failing on the
Trusty release job for a while and it is known that it won't be fixed until the
next kubernetes release, see https://github.com/google/cadvisor/issues/947 for
more details.

Let's blacklist it so that the release job can be used to catch other real
issues.

hack/jenkins/e2e.sh

@@ -231,7 +231,7 @@ GCE_SOAK_CONTINUOUS_SKIP_TESTS=(
 GCE_RELEASE_SKIP_TESTS=(
     )
 
-TRUSTY_SKIP_TESTS=(
+TRUSTY_DEFAULT_SKIP_TESTS=(
     # TODO(wonderfly): Remove this once
     # https://github.com/kubernetes/kubernetes/issues/12689 is fixed.
     "Services.*should\swork\safter\srestarting\skube-proxy"
@@ -243,6 +243,15 @@ TRUSTY_SKIP_TESTS=(
     "Kubelet\sregular\sresource\susage\stracking\sover\s30m0s\swith\s0\spods\sper\snode"
 )
 
+TRUSTY_SKIP_TESTS=(
+    "${TRUSTY_DEFAULT_SKIP_TESTS[@]}"
+    "Monitoring\sshould\sverify\smonitoring\spods\sand\sall\scluster\snodes\sare\savailable\son\sinfluxdb\susing\sheapster"
+)
+
+TRUSTY_BETA_SKIP_TESTS=(
+    "${TRUSTY_DEFAULT_SKIP_TESTS[@]}"
+)
+
 # Define environment variables based on the Jenkins project name.
 case ${JOB_NAME} in
   # Runs all non-flaky, non-slow tests on GCE, sequentially.
@@ -574,7 +583,7 @@ case ${JOB_NAME} in
           ${GCE_RELEASE_SKIP_TESTS[@]:+${GCE_RELEASE_SKIP_TESTS[@]}} \
           ${GCE_FLAKY_TESTS[@]:+${GCE_FLAKY_TESTS[@]}} \
           ${GCE_SLOW_TESTS[@]:+${GCE_SLOW_TESTS[@]}} \
-          ${TRUSTY_SKIP_TESTS[@]:+${TRUSTY_SKIP_TESTS[@]}} \
+          ${TRUSTY_BETA_SKIP_TESTS[@]:+${TRUSTY_BETA_SKIP_TESTS[@]}} \
           )"}
     : ${KUBE_GCE_INSTANCE_PREFIX="e2e-gce"}
     : ${PROJECT:="k8s-e2e-gce-trusty-beta"}
@@ -593,7 +602,7 @@ case ${JOB_NAME} in
     : ${GINKGO_TEST_ARGS:="--ginkgo.focus=$(join_regex_no_empty \
           ${GCE_SLOW_TESTS[@]:+${GCE_SLOW_TESTS[@]}} \
           ) --ginkgo.skip=$(join_regex_allow_empty \
-          ${TRUSTY_SKIP_TESTS[@]:+${TRUSTY_SKIP_TESTS[@]}} \
+          ${TRUSTY_BETA_SKIP_TESTS[@]:+${TRUSTY_BETA_SKIP_TESTS[@]}} \
           )"}
     : ${KUBE_GCE_INSTANCE_PREFIX="e2e-trusty-beta-slow"}
     : ${PROJECT:="k8s-e2e-gce-trusty-beta-slow"}