schema: allow boot_character_delay in the context

This is used in one linaro lab health check.

Signed-off-by: Rémi Duraffort <remi.duraffort@linaro.org>
15 jobs for <span class="ref-name">schema_context</span> in 13 minutes and 23 seconds (queued for 1 minute and 23 seconds)
Status Job ID Name Coverage
  Test
passed #48946
amd64
dispatcher-debian-10

00:04:09

passed #48944
amd64
dispatcher-debian-9

00:04:34

passed #48947
amd64
server-debian-10

00:03:35

passed #48945
amd64
server-debian-9

00:03:18

 
  Analyze
passed #48949
amd64
black

00:01:16

passed #48951
amd64
code_quality

00:00:50

passed #48950
amd64
codestyle

00:01:23

passed #48953
amd64
job-schema

00:01:16

passed #48952
amd64
pylint

00:03:20

passed #48948
amd64-dind allowed to fail
sast

00:03:05

 
  Build
passed #48956
amd64
amd64/pkg-debian-10

00:02:28

passed #48955
amd64
amd64/pkg-debian-9

00:02:41

passed #48954
amd64
doc

00:02:40

 
  Docker
passed #48957
amd64-dind
amd64/lava-dispatcher

00:00:56

passed #48958
amd64-dind
amd64/lava-server

00:02:05