Cleanup configuration

Add pool configuration into CRD & charts. Add preliminary documentation.
Rename NumberOfInstances to Replicas like in Deployment. Mention couple
of potential improvement points for connection pool specification.

manifests/operatorconfiguration.crd.yaml

@@ -297,6 +297,24 @@ spec:
             connection_pool:
               type: object
               properties:
+                connection_pool_schema:
+                  type: string
+                  #default: "pooler"
+                connection_pool_user:
+                  type: string
+                  #default: "pooler"
+                connection_pool_instances_number:
+                  type: integer
+                  #default: 1
+                connection_pool_image:
+                  type: string
+                  #default: "registry.opensource.zalan.do/acid/pgbouncer:1.0.0"
+                connection_pool_mode:
+                  type: string
+                  enum:
+                    - "session"
+                    - "transaction"
+                  #default: "transaction"
                 connection_pool_default_cpu_limit:
                   type: string
                   pattern: '^(\d+m|\d+(\.\d{1,3})?)$'
@@ -313,24 +331,6 @@ spec:
                   type: string
                   pattern: '^(\d+(e\d+)?|\d+(\.\d+)?(e\d+)?[EPTGMK]i?)$'
                   #default: "100Mi"
-                connection_pool_image:
-                  type: string
-                  #default: "pierone.stups.zalan.do/acid/pgbouncer:0.0.1"
-                connection_pool_instances_number:
-                  type: integer
-                  #default: 1
-                connection_pool_mode:
-                  type: string
-                  enum:
-                    - "session"
-                    - "transaction"
-                  #default: "transaction"
-                connection_pool_schema:
-                  type: string
-                  #default: "pooler"
-                connection_pool_user:
-                  type: string
-                  #default: "pooler"
         status:
           type: object
           additionalProperties:

manifests/postgresql.crd.yaml

@@ -206,6 +206,22 @@ spec:
                     type: string
             replicaLoadBalancer:  # deprecated
               type: boolean
+            connectionPool:
+              type: object
+              properties:
+                schema:
+                  type: string
+                user:
+                  type: string
+                replicas:
+                  type: integer
+                dockerImage:
+                  type: string
+                mode:
+                  type: string
+                  enum:
+                    - "session"
+                    - "transaction"
             resources:
               type: object
               required: