Bug 15720: Add connexion user and password options to connexion daemon

Bug 15720: Add connexion user and password options to connexion daemon

Currently the connexion daemon does not utilize the user and password passed in the requests, it expects a
user and password to be defined in the config file and for that user to be a valid Koha user with
cataloging permissions.

With that user in place all requests to the daemon are authorized.

As the connections are over TCP we allow defining a new connexion user and password to protect Koha account information.

If not defined current behaviour is preserved. Connexion user and password must both be set it either is set.

Sample config file:
host:
port: 8888
koha:http://localhost:8081
log:/var/log/koha/kohadev/connexion.log
match:ISBN
user:kohauser
password:kohapass
overlay_action:replace
nomatch_action:create_new
item_action:always_add
import_mode:redirect
debug:1

To test:
 1 - Create connexion file and save on the Koha serve
 2 - perl misc/bin/connexion_import_daemon.pl -c /kohadevbox/koha/connexion.cnf
 3 - Ensure the user specified above (connexuser) exists and has edit catalogue permissions
 4 - In another terminal make a request to the server:
        echo -en 'U6turtleA9connexionP5shell00024    a62clear00024   4500' | nc -v localhost 8888
 5 - The request should succeed and record added to batch (probably the import fails, but not important)
 6 - Add to config file
        connexion_user:conuser
 7 - Stop and restart the daemon - it should fail on missing connexion_password
 8 - Comment out connexion_user and add
        connexion_password:conpass
 9 - Stop and restart daemon, it fails on missing connexion_user
10 - Uncomment the user and restart
11 - Make another request
        echo -en 'U6turtleA9connexionP5shell00024    a62clear00024   4500' | nc -v localhost 8888
12 - It fails 'Unauthorized request'
13 - Make another request
        echo -en 'U7conuserA9connexionP7conpass00024    a62clear00024   4500' | nc -v localhost 8888
14 - It succeeds!

Signed-off-by: Allison Blanning <ablanning@hotchkiss.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>