Introduce get_run_dir function

Run dir (LOCALSTATEDIR/lib/corosync) was hardcoded thru whole codebase.
Totemsrp was trying to create and chdir into it, but also
takes into account environment variable COROSYNC_RUN_DIR creating
inconsistency.

get_run_dir correctly returns COROSYNC_RUN_DIR (when set) or
LOCALSTATEDIR/lib/corosync. This is now used by all functions instead of
hardcoded string.

All occurrences of mkdir/chdir are removed from totemsrp and chdir is
now called in main function. Mkdir call is completely removed, because
it was not used anyway (check in main.c was called before totemsrp init,
so mkdir was never called) and also make install and/or package system
should take care of creating this directory with correct
permissions/context.

Signed-off-by: Jan Friesse <jfriesse@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Move ringid store and load from totem library

Functions for storing and loading ring id was in the totem library. This
causes problem, what to do when it's impossible to load or store ring
id. Easy solution seemed to be assert, but sadly this makes hard for
user to find out what happened (because corosync was just aborted and
logsys didn't flush)

Solution is to move these functions to main.c, where is much easier to
handle error. This also makes libtotem free of any file system
operations.

Signed-off-by: Jan Friesse <jfriesse@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>