Add documentation on reloading certificates

10 jobs for reload_certificate in 5 minutes and 21 seconds (queued for 8 seconds)
Status Job ID Name Coverage
  Build
passed #391313
build:debian:jessie

00:04:03

passed #391314
build:debian:stretch

00:01:35

passed #391312
build:el7

00:01:24

passed #391311
build:tarball

00:00:35

 
  Test
passed #391320
docs

00:01:15

passed #391315
test:python2.7

00:00:43

passed #391316
test:python3.4

00:00:55

passed #391317
test:python3.5

00:00:59

passed #391318
test:python3.6

00:00:52

passed #391319
test:python3.7

00:00:59