doc/flowcharts: use underscores instead of spaces in filename

32 jobs from doc-rename-flowcharts in 9 minutes and 43 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #233708
docker linux amd64
build:asan:linux:amd64

00:01:15

passed #233707
docker linux amd64
build:linux:amd64

00:01:18

passed #233709
docker linux amd64
build:turris:omnia

00:01:15

passed #233710
docker linux amd64 allowed to fail
srpm

00:00:48

 
  Test
passed #233719
docker linux amd64
deckard:linux:amd64

00:01:52

passed #233727
privileged
distro:epel-7

00:02:25

passed #233726
privileged
distro:fedora-29

00:03:03

passed #233718
docker
doc

00:00:52

passed #233716
dind
docker:build

00:02:40

passed #233717
docker linux amd64
installcheck:linux:amd64

00:01:12

passed #233720
docker linux amd64
installcheck:valgrind:linux:amd64

00:02:32

passed #233713
docker
lint:c

00:02:53

passed #233714
docker
lint:clang-scan-build

00:01:14

passed #233712
docker
lint:lua

00:00:26

passed #233711
docker linux amd64
lint:pedantic

00:01:35

passed #233721
docker
osx:build

00:02:16

passed #233723
docker linux amd64
pytests:lint

00:00:46

passed #233724
docker linux amd64
pytests:run

00:02:11

passed #233725
docker linux amd64
respdiff:iter:udp:linux:amd64

00:04:38

passed #233715
docker linux amd64
test:linux:amd64

00:01:09

passed #233722
docker linux amd64
test:linux:amd64:valgrind

00:01:35

 
  Extended
passed #233728
docker linux amd64
pytests:extended

00:03:13

passed #233729
respdiff
respdiff:fwd-tls6-kresd.udp6

00:00:17

passed #233730
respdiff
respdiff:fwd-udp6-kresd.udp6

00:00:17

passed #233734
respdiff
respdiff:fwd-udp6-unbound.tcp6

00:00:16

passed #233735
respdiff
respdiff:fwd-udp6-unbound.tls6

00:00:17

passed #233733
respdiff
respdiff:fwd-udp6-unbound.udp6

00:00:17

passed #233732
respdiff
respdiff:iter.tls6

00:00:17

passed #233731
respdiff
respdiff:iter.udp6

00:00:17

passed #233736
respdiff
resperf:fwd-tls6.udp-asan

00:00:17

passed #233737
respdiff
resperf:fwd-udp6.udp-asan

00:00:16

passed #233738
respdiff
resperf:iter.udp-asan

00:00:16