cloudapi: validate input

Validate incoming requests with openapi3. Remove unsupported
uuid format from the openapi spec. Similarly, change url to uri as
uri is a supported format and url is not.

Co-authored-by: Ondřej Budai <obudai@redhat.com>
Signed-off-by: Ondřej Budai <ondrej@budai.cz>

vendor/github.com/getkin/kin-openapi/openapi3/testdata/recursiveRef/components/Bar.yml

@@ -0,0 +1,2 @@
+type: string
+example: bar

vendor/github.com/getkin/kin-openapi/openapi3/testdata/recursiveRef/components/Foo.yml

@@ -0,0 +1,4 @@
+type: object
+properties:
+  bar:
+    $ref: ../openapi.yml#/components/schemas/Bar

vendor/github.com/getkin/kin-openapi/openapi3/testdata/recursiveRef/components/Foo/Foo2.yml

@@ -0,0 +1,4 @@
+type: object
+properties:
+  foo:
+    $ref: ../../openapi.yml#/components/schemas/Foo

vendor/github.com/getkin/kin-openapi/openapi3/testdata/recursiveRef/openapi.yml

@@ -0,0 +1,15 @@
+openapi: "3.0.3"
+info:
+  title: Recursive refs example
+  version: "1.0"
+paths:
+  /foo:
+    $ref: ./paths/foo.yml
+components:
+  schemas:
+    Foo:
+      $ref: ./components/Foo.yml
+    Foo2:
+      $ref: ./components/Foo/Foo2.yml
+    Bar:
+      $ref: ./components/Bar.yml

vendor/github.com/getkin/kin-openapi/openapi3/testdata/recursiveRef/paths/foo.yml

@@ -0,0 +1,11 @@
+get:
+  responses:
+    "200":
+      description: OK
+      content:
+        application/json:
+          schema:
+            type: object
+            properties:
+              foo2:
+                $ref: ../openapi.yml#/components/schemas/Foo2