Add the required --runtime-jdk parameter to Vagrantfile (elastic#279)

Since elastic#264 night-rally requires runtime JDK to be specified as cmd
param.

Relates to elastic/night-rally#264

night_rally/fixtures/ansible/Vagrantfile

@@ -164,16 +164,16 @@ def install_night_rally_test_script(base_ip, target_node_ip_addresses)
     set -eo pipefail
     source /var/lib/jenkins/env_test_script
     # release-license is oss just because it's the default option in the JJB dropdown; will be ignored in nightly mode
-    night_rally --target-host="${TARGET_HOSTS}" --race-configs="resources/race-configs-group-1.json" --effective-start-date="" --mode="nightly" --version="master" --release-license="oss" --release-x-pack-components=""
-    night_rally --target-host="${TARGET_HOSTS}" --race-configs="resources/race-configs-group-2.json" --effective-start-date="" --mode="nightly" --version="master" --release-license="oss" --release-x-pack-components=""
+    night_rally --target-host="${TARGET_HOSTS}" --race-configs="resources/race-configs-group-1.json" --effective-start-date="" --mode="nightly" --version="master" --release-license="oss" --release-x-pack-components="" --runtime-jdk="bundled"
+    night_rally --target-host="${TARGET_HOSTS}" --race-configs="resources/race-configs-group-2.json" --effective-start-date="" --mode="nightly" --version="master" --release-license="oss" --release-x-pack-components="" --runtime-jdk="bundled"
     EOF2
 
     cat >/var/lib/jenkins/test_release.sh <<"EOF2"
     #!/usr/bin/env bash
     set -eo pipefail
     source /var/lib/jenkins/env_test_script
-    night_rally --target-host="${TARGET_HOSTS}" --race-configs="resources/race-configs-group-1.json" --effective-start-date="" --mode="release" --version="6.8.7" --release-license="oss" --release-x-pack-components=""
-    night_rally --target-host="${TARGET_HOSTS}" --race-configs="resources/race-configs-group-2.json" --effective-start-date="" --mode="release" --version="6.8.7" --release-license="oss" --release-x-pack-components=""
+    night_rally --target-host="${TARGET_HOSTS}" --race-configs="resources/race-configs-group-1.json" --effective-start-date="" --mode="release" --version="6.8.7" --release-license="oss" --release-x-pack-components="" --runtime-jdk="14"
+    night_rally --target-host="${TARGET_HOSTS}" --race-configs="resources/race-configs-group-2.json" --effective-start-date="" --mode="release" --version="6.8.7" --release-license="oss" --release-x-pack-components="" --runtime-jdk="14"
     EOF2
 
     cat >/var/lib/jenkins/test_longrunning.sh <<"EOF2"