Fix for #1009. The data to be uploaded is signed before opening the  connection with the node, thus preventing the connection from idling.  This is in contrast to the previous version of fastnmclient.py, where  upon opening up the connection with the node, a few seconds are spent  signing the data to be sent, which would cause the connection to close  without having sent anything in the case of large group uploads.
Fix for #1009. The data to be uploaded is signed before opening the 
connection with the node, thus preventing the connection from idling. 
This is in contrast to the previous version of fastnmclient.py, where 
upon opening up the connection with the node, a few seconds are spent 
signing the data to be sent, which would cause the connection to close 
without having sent anything in the case of large group uploads.


sburnett/seattle,sburnett/seattle,sburnett/seattle,sburnett/seattle,sburnett/seattle,sburnett/seattle