Upgrade the benchmark slave to ubuntu 16.04

The benchmark job was using newer feature from git but it
was not available with the git ubuntu was providing. Probably
the old benchmark was using git provided by Jenkins.

Change-Id: I7988744e37b61ed8b23170916b6ebbcfdcea508d
diff --git a/gce/vm.sh b/gce/vm.sh
index 21c29fd..94712de 100755
--- a/gce/vm.sh
+++ b/gce/vm.sh
@@ -67,7 +67,7 @@
     "windows-slave-3 windows-server-2012-r2-dc-v20160112-vs2015-cpp-python-msys windows-x86_64-3 europe-west1-d default windows-startup-script-ps1=jenkins-slave-windows.ps1"
     "windows-slave-4 windows-server-2012-r2-dc-v20160112-vs2015-cpp-python-msys windows-x86_64-4 europe-west1-d default windows-startup-script-ps1=jenkins-slave-windows.ps1"
     # For benchmark
-    "ubuntu-14-04-benchmark-slave ubuntu-1404-lts ubuntu_14.04-x86_64-benchmark-1 europe-west1-d default startup-script=jenkins-slave.sh ubuntu-14-04-slave.sh bootstrap-bazel.sh linux-android.sh cleanup-install.sh"
+    "ubuntu-16-04-benchmark-slave ubuntu-1604-lts ubuntu_16.04-x86_64-benchmark-1 europe-west1-d default startup-script=jenkins-slave.sh ubuntu-16-04-slave.sh bootstrap-bazel.sh linux-android.sh cleanup-install.sh"
 )
 
 # Jenkins controller for ci.bazel.io
diff --git a/jenkins/BUILD b/jenkins/BUILD
index d032f6f..44060b9 100644
--- a/jenkins/BUILD
+++ b/jenkins/BUILD
@@ -34,9 +34,9 @@
 
 UBUNTU_1404_COUNT = 8
 
-UBUNTU_1404_BENCHMARK_PREFIX = "ubuntu_14.04-x86_64-benchmark"
+UBUNTU_1604_BENCHMARK_PREFIX = "ubuntu_16.04-x86_64-benchmark"
 
-UBUNTU_1404_BENCHMARK_COUNT = 1
+UBUNTU_1604_BENCHMARK_COUNT = 1
 
 UBUNTU_1604_PREFIX = "ubuntu_16.04-x86_64"
 
@@ -78,8 +78,8 @@
 )
 
 jenkins_nodes(
-    UBUNTU_1404_BENCHMARK_PREFIX,
-    UBUNTU_1404_BENCHMARK_COUNT,
+    UBUNTU_1604_BENCHMARK_PREFIX,
+    UBUNTU_1604_BENCHMARK_COUNT,
     install_bazel = False,
     labels = ["benchmark"],
     mode = "EXCLUSIVE",
@@ -273,7 +273,7 @@
               jenkins_node_names(WINDOWS_PREFIX, WINDOWS_COUNT) +
               jenkins_node_names(UBUNTU_DOCKER_PREFIX, UBUNTU_DOCKER_COUNT) +
               jenkins_node_names(UBUNTU_1404_PREFIX, UBUNTU_1404_COUNT) +
-              jenkins_node_names(UBUNTU_1404_BENCHMARK_PREFIX, UBUNTU_1404_BENCHMARK_COUNT) +
+              jenkins_node_names(UBUNTU_1604_BENCHMARK_PREFIX, UBUNTU_1604_BENCHMARK_COUNT) +
               jenkins_node_names(UBUNTU_1604_PREFIX, UBUNTU_1604_COUNT) +
               jenkins_node_names(FREEBSD_11_PREFIX, FREEBSD_11_COUNT) +
               jenkins_node_names(FREEBSD_12_PREFIX, FREEBSD_12_COUNT),