Fix malformed request bug with retried requests

Scenario:
1. request is made via Binding#call_remote
2. session is invalid, so we login to establish a new session
3. new request is made and sent

There was a bug in step three where the request was incorrectly
recreated.  A previous fix changed the initial request construction
but missed this.
Merge pull request #24 from jjolma/master

Fix malformed request bug with retried requests