resolver: Add path to resolv.conf to config options

Before (current state):
If the <STATEDIR> (/var/run/connman) directory exists, ConnMan writes
resolvfile into <STATEDIR>/resolv.conf. If it doesn't exist, it writes
into /etc/resolv.conf. If it fails, it does nothing.

Problem:
This is unclear and error prone. The user (or package maintainer) may
create the /var/run/connman directory for a pidfile or whatever and
surely doesn't expect ConnMan to suddenly stop updating
/etc/resolv.conf. Or the user doesn't want ConnMan to touch
/etc/resolv.conf (e.g. openresolv or similar tool is used),
ever. Configuring this use case by creating directory /run/connman (as
suggested e.g. on
https://wiki.archlinux.org/title/ConnMan#/etc/resolv.conf) is really
weird... and error prone.

After:
The user can explicitly set path for the resolvfile in connman.conf via
"ResolvConf" option. If this option is set, ConnMan writes
resolvfile to the specified file (and creates it if doesn't exist). If
it fails (e.g. directory doesn't exist or file is not writable) or the
path is /dev/null or an empty string, it does nothing.
If this option is not set, it behaves as before.

Signed-off-by: Daniel Wagner <wagi@monom.org>
Link: https://lore.kernel.org/r/20220615165350.11431-1-jakub@jirutka.cz

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