Unhardcode nova database connection parameters

[database]/[api_database]
idle_timeout = 180
min_pool_size = 100
max_pool_size = 700
max_overflow = 100
retry_interval = 5
max_retries = -1
db_max_retries = 3
db_retry_interval = 1
connection_debug = 10
pool_timeout = 120

Change-Id: I4bfa9ea7fdd1b91c0b43300df49ba79897bc7392
Related-Prod: PROD-26294
(cherry picked from commit f795791263b56462ca29235cf4d18c75d5f4c0fa)
diff --git a/tests/pillar/control_single.sls b/tests/pillar/control_single.sls
index 443e821..9423b53 100644
--- a/tests/pillar/control_single.sls
+++ b/tests/pillar/control_single.sls
@@ -36,6 +36,16 @@
       name: nova
       user: nova
       password: password
+      idle_timeout: 180
+      min_pool_size: 100
+      max_pool_size: 700
+      max_overflow: 100
+      retry_interval: 5
+      max_retries: '-1'
+      db_max_retries: 3
+      db_retry_interval: 1
+      connection_debug: 10
+      pool_timeout: 120
     identity:
       engine: keystone
       region: RegionOne