distbuild: Add protocol version checking for list-jobs command

Currently, the distbuild-list-jobs command will fail if morph is
outdated (i.e. protocol version for client and distbuild network
don't match); a protocol_version field has been added to the
list-jobs request message to fix this.

Moved version check outside build-request message to reduce duplication
in new functions.

Generalised the list-request output to reduce duplication for any
further additions that may require a message output.

Change-Id: I28e733cbfe8c89e8c11427df5d40ab275abd313c

1 files changed, 2 insertions, 1 deletions

diff --git a/distbuild/protocol.py b/distbuild/protocol.py
index 0f936946..2fbfa085 100644
--- a/distbuild/protocol.py
+++ b/distbuild/protocol.py
@@ -87,8 +87,9 @@ _required_fields = {
     ],
     'list-requests': [
         'id',
+        'protocol_version',
     ],
-    'list-request-output': [
+    'request-output': [
         'message',
     ],
 }