tests,vm-virtio,vmm: Use 'socket' for all CLI/API parameters

This patch unifies the inconsistent uses of 'socket' and 'sock' from our
CLI/API parameters.

Fixes: #1091

Signed-off-by: Bo Chen <chen.bo@intel.com>

vmm/src/api/openapi/cloud-hypervisor.yaml

@@ -506,12 +506,12 @@ components:
     FsConfig:
       required:
       - tag
-      - sock
+      - socket
       type: object
       properties:
         tag:
           type: string
-        sock:
+        socket:
           type: string
         num_queues:
           type: integer
@@ -581,7 +581,7 @@ components:
     VsockConfig:
       required:
       - cid
-      - sock
+      - socket
       type: object
       properties:
         cid:
@@ -589,7 +589,7 @@ components:
           format: int64
           minimum: 3
           description: Guest Vsock CID
-        sock:
+        socket:
           type: string
           description: Path to UNIX domain socket, used to proxy vsock connections.
         iommu: