configure ssl in deployment config

This patch enable ssl settings in deployment config and deprecate those
in rally.conf. Before those are totally removed from rally.conf, rally
will read those if no ssl settings in deployment config. This is for
back-compatibility.

Closes-Bug: #1430695
Change-Id: Idacbd99fae9de0c107d8bdaefb134663738ca497

samples/deployments/existing-keystone-v3.json

@@ -9,5 +9,7 @@
         "user_domain_name": "admin",
         "project_name": "admin",
         "project_domain_name": "admin",
-    }
+    },
+    "https_insecure": False,
+    "https_cacert": "",
 }

samples/deployments/existing-with-given-endpoint.json

@@ -8,5 +8,7 @@
         "username": "admin",
         "password": "pa55word",
         "tenant_name": "demo"
-    }
+    },
+    "https_insecure": False,
+    "https_cacert": "",
 }

samples/deployments/existing.json

@@ -7,5 +7,7 @@
         "username": "admin",
         "password": "myadminpass",
         "tenant_name": "demo"
-    }
+    },
+    "https_insecure": False,
+    "https_cacert": "",
 }