test-json: check absolute and relative difference in floating point test

The test fails under valgrind, so there was an exception for valgrind.
Unfortunately that check only works when valgrind-devel headers are
available during build. But it is possible to have just valgrind installed,
or simply install it after the build, and then "valgrind test-json" would
fail.

It also seems that even without valgrind, this fails on some arm32 CPUs.
Let's do the usual-style test for absolute and relative differences.

(cherry picked from commit aa70783f55b369521b94e0985e84bbdaae16b174)
(cherry picked from commit 88938bf95b850849d075d7a6ebe37bb1d9780efe)

Gbp-Pq: Name test-json-check-absolute-and-relative-difference-in-float.patch

Docs: Add Missing Space Between Words

(cherry picked from commit 8d7fac92f07cc662e51dcda7c9f3a322454895c7)
(cherry picked from commit e60c80a908a2c8c6036e41d083134c9e095aa268)

Gbp-Pq: Name Docs-Add-Missing-Space-Between-Words.patch

ask-password-api: do not call ask_password_keyring() if keyname == NULL

Fixes #11295.

(cherry picked from commit 1f00998c8739ac6adc2b7623cc1e5a8f67d95d7d)
(cherry picked from commit 095a38313daf043413c863634378c8ea7e5f6a09)

Gbp-Pq: Name ask-password-api-do-not-call-ask_password_keyring-if-keyn.patch

udev-event: do not read stdout or stderr if the pipefd is not created

Fixes #11255.

(cherry picked from commit adeb26c1affd09138bb96a9e25b795d146e64c97)
(cherry picked from commit 32a11a27b69031240beea38260d93e034ea33036)

Gbp-Pq: Name udev-event-do-not-read-stdout-or-stderr-if-the-pipefd-is-.patch

switch-root: fix error message

Fixes #11261.

(cherry picked from commit a5c67ccc575e6ebf12710cb7df84f65a51c5dc58)
(cherry picked from commit ebcd154e1df434865d2752efdccbc7737bb28029)

Gbp-Pq: Name switch-root-fix-error-message.patch

core: free lines after reading them

Closes https://github.com/systemd/systemd/issues/11251.

(cherry picked from commit 7334ade4a7e103b1a01d1c8fe1ea7c7a854a1c31)
(cherry picked from commit 5fa79ab2eb900fc58824060e3dcf9508276c9047)

Gbp-Pq: Name core-free-lines-after-reading-them.patch

Do not start server if it is already runnning (#11245)

(cherry picked from commit 7da7340afdd4760fb2dd9d000105c324a77aff4b)

Gbp-Pq: Name Do-not-start-server-if-it-is-already-runnning-11245.patch

systemd (240-5) unstable; urgency=medium

  [ Felipe Sateler ]
  * Revert interface renaming changes. (Closes: #919390)

  [ Martin Pitt ]
  * process-util: Fix memory leak (Closes: #920018)

[dgit import unpatched systemd 240-5]

Import systemd_240-5.debian.tar.xz

[dgit import tarball systemd 240-5 systemd_240-5.debian.tar.xz]

Import systemd_240.orig.tar.gz

[dgit import orig systemd_240.orig.tar.gz]