Bug 32794: Expand tests for access method in XLST files

Bug 32794: Expand tests for access method in XLST files

This patch expands the checks for 856u to check for mailto, and adds a few conditiona
checks of the first indicator to cover more methods

Reference: https://www.oclc.org/bibformats/en/8xx/856.html

To test:
1 - Edit a record and add a few 856 fields:
    856 0 0 $umailto:test@example.org
    856 0 0 $utest@example.org
    856 2 0 $utelnet://pucc.princeton.edu
    856 2 0 $upucc.princeton.edu
    856 3 0 $u8885555555
2 - View staff details and results and opac details and results
3 - Note all links have been prepended with http://
4 - Apply patch
5 - Refresh all views, ensure links are correctly formed

Signed-off-by: Phil Ringnalda <phil@chetcolibrary.org>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>