Allow register-node to accept int for input

register-node used to pipe the nodes definition file through jq, which
explicitly converts all int values to strings, but the new
implementation doesn't do so, which is backward incompatible.

Change-Id: Id5c5b56ccd73bdabe02eb24575e5b8c4dbcdb04b
Closes-Bug: #1382275
Merge "Allow register-node to accept int for input"