Bug 35918: Fix auto library connect (AutoLocation)

Bug 35918: Fix auto library connect (AutoLocation)

This code is a bit weird, its purpose it to auto select the library depending on the IP.
A problem appears if the same IP is used, then the user's choice will
might be overwritten randomly by another library.

To recreate the problem:
Turn on AutoLocation
Use koha/koha @CPL for test
And the following config:
*************************** 1. row ***************************
branchcode: CPL
branchname: Centerville
  branchip: 172.18.0.1
*************************** 2. row ***************************
branchcode: FFL
branchname: Fairfield
  branchip: 172.18.0.1
*************************** 3. row ***************************
branchcode: FPL
branchname: Fairview
  branchip: 172.18.0.4

Connect and select CPL. Randomly FFL will be picked instead.

Signed-off-by: Magnus Enger <magnus@libriotech.no>
Tested this on top of 35890 and 35904 because git bz said they were required dependencies.
Figured out the IP Koha was seeing me as coming from in /var/log/koha/kohadev/plack.log.
Added that IP to the branchip for Centerville, Fairfield and Fairview. Set AutoLocation = Yes.
After this I could recreate the problem: If i left the "Library" field in the login screen
at "My Library" I got logged into a random library selected from the three i had set
branchip for. Applying the patches fixed this, as expected.
Tests pass, with AutoLocation off.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>