Switch to using forked version of Davrods

[mikkonie]

While doing #3, I'm doing ugly sed hacks to edit the Davrods repo in order to work with iRODS 4.3, token passwords etc.

Instead, I should fork the repo, make the changes there and have a "clean" dependency.

Bits to edit directly in forked repo:

• sed -i 's/rods_auth_ttl = 1/rods_auth_ttl = 336/g' /tmp/davrods/src/config.c
• sed -i 's/strlen(password) > 63/strlen(password) > 128/g' /tmp/davrods/src/auth.c
• sed -i 's/module AP_MODULE_DECLARE_DATA davrods_module;/extern module AP_MODULE_DECLARE_DATA davrods_module;/g' /tmp/davrods/src/mod_davrods.h

TBD: Leave the iRODS package version replacement as is or improve this somehow? Ideally it should be modifiable by an env var, IMHO.

I want to make sure everything is properly working for #3 and #6 before I do this. Hence a separate issue.

[mikkonie]

Done.