cylc scan: Update CHANGES.md + on daemonize help

Note that `cylc scan --name=PATTERN` will require a pattern to match
full names of suites.

CHANGES.md

@@ -71,6 +71,13 @@ from multi-line `script` items in task definitions, for cleaner job scripts.
 
 ### Fixes
 
+[#2666](https://github.com/cylc/cylc/pull/2666) - `cylc scan`: fix default
+behavior to only obtain suite information from the `~/cylc-run/` of the current
+user. This is consistent with `cylc gscan`. However, the `--name=PATTERN`
+(`-n PATTERN`) option has also been modified to be consistent with
+`cylc gscan`, so `cylc scan --name=bar` will only match the suite `bar` but not
+the suites `foobar` and `barbaz`.
+
 [#2593](https://github.com/cylc/cylc/pull/2593) - fix polling after job
 execution timeout (configured pre-poll delays were being ignored).
 

lib/cylc/daemonize.py

@@ -30,7 +30,7 @@
  $ cylc get-suite-contact %(suite)s
 
 Other ways to see if the suite is still running:
- $ cylc scan -n '\b%(suite)s\b' %(host)s
+ $ cylc scan -n '%(suite)s' %(host)s
  $ cylc ping -v --host=%(host)s %(suite)s
  $ ps %(ps_opts)s %(pid)s  # on %(host)s