nfsdcltrack: read configuration from a file

As nfsdcltrack is normally run directly from the kernel
there is no opportunity to change the default
storage directory.  This can be useful in a cluster to
locate the "storage directory" on shared storage.

The easiest alternative is to allow configuration to be read from a
file, particularly as nfs-utils already has code for parsing a config
file.

So read the config file "/etc/nfs.conf" (or as set by ./configure) and
look for "storagedir" and "debug" in the "nfsdcltrack" section.
These values can still be over-ridden by command line options.

A generic name (nfs.conf) was changes for the config file so that
other daemons can be enhanced to read configuration from there.
This may be easier than passing command line arguments through systemd.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Steve Dickson <steved@redhat.com>

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