Merge branch 'cboltz-dovecot-dumpable' into 'master'

dovecot: allow reading /proc/sys/fs/suid_dumpable

This is needed if a dovecot child process segfaults - in this case, dovecot provides a helpful error message like

dovecot[6179]: auth-worker: Fatal: master: service(auth-worker): child 8103 killed with signal 11 (core not dumped - https://dovecot.or /bugreport.html#coredumps - set /proc/sys/fs/suid_dumpable to 2)

which involves reading the current value in suid_dumpable.

I propose this fix for 2.10..master.

PR: !286
Acked-by: John Johansen <john.johansen@canonical.com>
2 jobs from master in 10 minutes and 35 seconds
Status Job ID Name Coverage
  Build
passed #131758002
build-all

00:02:40

 
  Test
passed #131758003
test-all

00:07:54