Renames http_api -> input as in tutorial

Signed-off-by: Jonathan Dursi <jonathan@dursi.ca>

api_authz/docker/policy/api_authz.rego

@@ -3,8 +3,8 @@ package httpapi.authz
 subordinates = {"alice": [], "charlie": [], "bob": ["alice"], "betty": ["charlie"]}
 
 # HTTP API request
-import input as http_api
-# http_api = {
+import input
+# input = {
 #   "path": ["finance", "salary", "alice"],
 #   "user": "alice",
 #   "method": "GET"
@@ -14,14 +14,14 @@ default allow = false
 
 # Allow users to get their own salaries.
 allow {
-  http_api.method = "GET"
-  http_api.path = ["finance", "salary", username]
-  username = http_api.user
+  input.method = "GET"
+  input.path = ["finance", "salary", username]
+  input.user == username
 }
 
 # Allow managers to get their subordinates' salaries.
 allow {
-  http_api.method = "GET"
-  http_api.path = ["finance", "salary", username]
-  subordinates[http_api.user][_] = username
+  input.method = "GET"
+  input.path = ["finance", "salary", username]
+  subordinates[input.user][_] == username
 }