Add ansible_connection=local to localhost in inventory

inventory/aws/hosts/hosts

@@ -1 +1 @@
-localhost ansible_sudo=no ansible_python_interpreter=/usr/bin/python2
+localhost ansible_connection=local ansible_sudo=no ansible_python_interpreter=/usr/bin/python2

inventory/gce/hosts/hosts

@@ -1 +1 @@
-localhost ansible_sudo=no ansible_python_interpreter=/usr/bin/python2
+localhost ansible_connection=local ansible_sudo=no ansible_python_interpreter=/usr/bin/python2

inventory/libvirt/hosts/hosts

@@ -1 +1 @@
-localhost ansible_sudo=no ansible_python_interpreter=/usr/bin/python2 connection=local
+localhost ansible_connection=local ansible_sudo=no ansible_python_interpreter=/usr/bin/python2