Fixed building from F27 sources - python-pymongo buildrequires

dependency

Removed asio - mongodb uses bundled one

Update buildorders to allow parallel building

mongodb.yaml

@@ -45,22 +45,22 @@ data:
     components:
         rpms:
             mongodb:
-                rationale:  MongoDB  package.
+                rationale: MongoDB package.
                 ref: f27
-                buildorder: 10
+                buildorder: 2
             python-pymongo:
-                rationale:  MongoDB dependecy.
+                rationale: MongoDB dependecy for running testsuite.
                 ref: f27
-                buildorder: 8
+                buildorder: 3
             yaml-cpp:
                 rationale: MongoDB dependency.
                 ref: f27
-                buildorder: 9
-            asio:
-                rationale: MongoDB dependency.
-                ref: f27
-                buildorder: 7
+                buildorder: 0
             mozjs45:
-                rationale: MongoDB dependency.
+                rationale: MongoDB dependency (not used on x64_64,s390x,aarch64 and ppc64le).
                 ref: f27
-                buildorder: 1
+                buildorder: 0
+            python-pymongo:
+                rationale: MongoDB dependecy (F26 branch does not require mongodb for tests).
+                ref: f26
+                buildorder: 0