Bug 36941: Limit login branch list when IP restriction enabled

Bug 36941: Limit login branch list when IP restriction enabled

This patch adds a new 'ip_limit' option to Koha::Template:Plugin::Branches

To test:
1 - Set some branches in the system to have random IPs
2 - Set one branch to have your IP
    To find the IP in KTD I:
    Enabled ILS-DI
    Set ILS-DI:AuthorizedIPs to 1.1.1.1
    Visit:
    http://localhost:8080/cgi-bin/koha/ilsdi.pl?service=GetAvailability&id=248&id_type=biblio
    And note the unauthorized IP listed
3 - Log out, confirm all branches are listed
4 - Log in, enable StaffLoginRestrictLibraryByIP
5 - Log out, confirm branches with IPs are removed
6 - Confirm branch matching your IP is listed
7 - Choose any of the branches and login
8 - Confirm login works

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>