Move project_name and kolla_role_name to role vars

Role vars have a higher precedence than role defaults. This allows to
import default vars from another role via vars_files without overriding
project_name (see closed bug for details).

Compared to wallaby, this cherry picked change includes the karbor,
qinling and searchlight roles.

Change-Id: I3d919736e53d6f3e1a70d1267cf42c8d2c0ad221
Closes-Bug: #1951785
(cherry picked from commit 56fc74f)
(cherry picked from commit 6c69556)
(cherry picked from commit 6cb0e10)

Author: priteau

ansible/roles/aodh/defaults/main.yml

@@ -1,6 +1,4 @@
 ---
-project_name: "aodh"
-
 aodh_services:
   aodh-api:
     container_name: aodh_api

ansible/roles/aodh/vars/main.yml

@@ -0,0 +1,2 @@
+---
+project_name: "aodh"

ansible/roles/barbican/defaults/main.yml

@@ -1,6 +1,4 @@
 ---
-project_name: "barbican"
-
 barbican_services:
   barbican-api:
     container_name: barbican_api

ansible/roles/barbican/vars/main.yml

@@ -0,0 +1,2 @@
+---
+project_name: "barbican"

ansible/roles/bifrost/defaults/main.yml

@@ -1,6 +1,4 @@
 ---
-project_name: "bifrost"
-
 ####################
 # Docker
 ####################

ansible/roles/bifrost/vars/main.yml

@@ -0,0 +1,2 @@
+---
+project_name: "bifrost"

ansible/roles/blazar/defaults/main.yml

@@ -1,6 +1,4 @@
 ---
-project_name: "blazar"
-
 blazar_services:
   blazar-api:
     container_name: blazar_api

ansible/roles/blazar/vars/main.yml

@@ -0,0 +1,2 @@
+---
+project_name: "blazar"

ansible/roles/ceilometer/defaults/main.yml

@@ -1,6 +1,4 @@
 ---
-project_name: "ceilometer"
-
 ceilometer_services:
   ceilometer-notification:
     container_name: ceilometer_notification

ansible/roles/ceilometer/vars/main.yml

@@ -0,0 +1,2 @@
+---
+project_name: "ceilometer"