CORD-1151
Make cord_dir and cord_profile_dir local to config node
use head_* and config_* prefixes to avoid hardcoding paths
config-side ssh key generation+
fix frontend & mock builds
[build] group in inventory
fix inventory strangeness
raise privs when creating ssh_pki_dir
move admin-openrc.sh.j2 to cord-profile
add copy-cord-playbook.yml, clarify where it runs
fix paths for head_cord_profile_dir with mock/frontend
use /opt/cord_profile/admin-openrc.sh rather than ~/admin-openrc.sh
install pki
make comment in do-enlist-compute-node accurate, set correct interface
remove hardcoded credential path
logging and ssh key fixes

Change-Id: Ie7560c911dce1558e09806c9997884dfbd475e9c
diff --git a/inventory/frontend b/inventory/frontend
index 0f6abe8..27f57c5 100644
--- a/inventory/frontend
+++ b/inventory/frontend
@@ -3,6 +3,14 @@
 [all:vars]
 cord_profile=frontend
 
+[config]
+localhost ansible_connection=local
+
 [head]
 localhost ansible_connection=local
 
+[build]
+localhost ansible_connection=local
+
+[compute]
+