godeps: bump coreos/pkg/capnslog

[jonboulle]

Update to catch coreos/pkg#43 which should fix SYSLOG_IDENTIFIER getting
set when etcd is logging to the journal.

Before:

; journalctl -t etcd
-- No entries --

After:

; journalctl -t etcd
-- Logs begin at Mon 2014-08-11 02:58:28 CEST, end at Fri 2015-11-06 18:45:34 CET. --
Nov 06 18:45:33 trevize etcd[14200]: etcd Version: 2.3.0-alpha.0+git
Nov 06 18:45:33 trevize etcd[14200]: Git SHA: 6f8356ba405c
Nov 06 18:45:33 trevize etcd[14200]: Go Version: go1.5.1
Nov 06 18:45:33 trevize etcd[14200]: Go OS/Arch: linux/amd64
Nov 06 18:45:33 trevize etcd[14200]: setting maximum number of CPUs to 4, total number of available CPUs is 4
Nov 06 18:45:33 trevize etcd[14200]: no data-dir provided, using default data-dir ./default.etcd
Nov 06 18:45:33 trevize etcd[14200]: the server is already initialized as member before, starting as etcd member...
Nov 06 18:45:33 trevize etcd[14200]: listening for peers on http://localhost:2380
Nov 06 18:45:33 trevize etcd[14200]: listening for peers on http://localhost:7001
Nov 06 18:45:33 trevize etcd[14200]: listening for client requests on http://localhost:2379
Nov 06 18:45:33 trevize etcd[14200]: listening for client requests on http://localhost:4001

Fixes #3828

[yichengq]

awesome. LGTM. This deserves to be backport IMO.

[jonboulle]

@yichengq to which?

[yichengq]

To release-2.2. For now, adding 'kind/backport' is good enough.