Generate hosts script (#1112)

* Generate hosts script

* Change the go version
diff --git a/tests/src/integration/helloworld/manifest.yaml b/tests/src/integration/helloworld/manifest.yaml
index 3a65418..4451de1 100644
--- a/tests/src/integration/helloworld/manifest.yaml
+++ b/tests/src/integration/helloworld/manifest.yaml
@@ -178,7 +178,7 @@
                   msg["greeting"] = "Hello, " + name + "!"
                   return msg
                 }
-          runtime: go:1.11
+          runtime: go:1.15
       sequences:
         # sequence of helloworld in all four runtimes
         hello-world-series:
diff --git a/tools/travis/script.sh b/tools/travis/script.sh
index af2c353..12d534b 100755
--- a/tools/travis/script.sh
+++ b/tools/travis/script.sh
@@ -44,7 +44,7 @@
 cd $WHISKDIR
 ./tools/travis/setup.sh
 
-ANSIBLE_CMD="ansible-playbook -i ${ROOTDIR}/ansible/environments/local -e docker_image_prefix=openwhisk -e docker_image_tag=nightly"
+ANSIBLE_CMD="ansible-playbook -i ${WHISKDIR}/ansible/environments/local -e docker_image_prefix=openwhisk -e docker_image_tag=nightly"
 
 cd $WHISKDIR/ansible
 $ANSIBLE_CMD setup.yml