stack/resilient: Keep etc/promise

Unfortunately pbs recipe is just simply creating an executable to check own
state, so keep the etc/promise directory in the partition for now, as it is
supported by monitoring checks.

stack/resilient/buildout.hash.cfg

@@ -26,7 +26,7 @@ md5sum = 2e804e06b5203c3f127c31a1704c48bd
 
 [template-pull-backup]
 filename = instance-pull-backup.cfg.in
-md5sum = f5695e6bcdb2a63a4990fe82b2083def
+md5sum = 0bbe16f3d805afd880a251a4f40ecaf1
 
 [template-replicated]
 filename = template-replicated.cfg.in

stack/resilient/instance-pull-backup.cfg.in

@@ -42,6 +42,7 @@ log = $${rootdirectory:var}/log
 services = $${rootdirectory:etc}/service
 run = $${rootdirectory:var}/run
 backup = $${rootdirectory:srv}/backup
+promises = $${rootdirectory:etc}/promise
 ssh-home = $${rootdirectory:etc}/ssh
 notifier = $${rootdirectory:etc}/notifier
 
@@ -119,6 +120,7 @@ notifier-binary = ${buildout:bin-directory}/pubsubnotifier
 rdiffbackup-binary = ${buildout:bin-directory}/rdiff-backup
 sshclient-binary = $${openssh-client:wrapper-path}
 known-hosts = $${directory:dot-ssh}/known_hosts
+promises-directory = $${basedirectory:promises}
 directory = $${directory:pbs-backup}
 cron-entries = $${cron:cron-entries}
 wrappers-directory = $${directory:pbs-wrappers}