initrd: use nm_utils_strsplit_set_with_empty() to split strings in nmi_dt_reader_parse()

strsplit() can be done in O(n) runtime and one memory allocation.
g_strsplit() creates a deepcopied strv array, requiring allocate
memory for each token separately. Also, it's implemented by constructing
the list with a tempory GSList, so it actually needs two allocations
for each tokens.

I think we should not use such wasteful API, if we don't need a clone
of the tokens.
18 jobs for th/initrd-parse-cleanup in 38 minutes and 10 seconds (queued for 20 seconds)
latest
Status Job ID Name Coverage
  Test
passed #724580
allowed to fail
checkpatch

00:01:02

manual #724586
allowed to fail manual
t_centos:7.5.1804
passed #724587
t_centos:7.6.1810

00:25:50

passed #724593
t_debian:10

00:17:40

passed #724592
t_debian:9

00:17:44

passed #724595
t_debian:sid

00:19:47

manual #724594
allowed to fail manual
t_debian:testing
manual #724581
allowed to fail manual
t_fedora:28
passed #724582
t_fedora:29

00:37:38

passed #724583
t_fedora:30

00:28:32

passed #724584
t_fedora:31

00:30:00

manual #724585
allowed to fail manual
t_fedora:rawhide
failed #724588
t_ubuntu:16.04

00:25:13

passed #724589
t_ubuntu:18.04

00:27:35

manual #724591
allowed to fail manual
t_ubuntu:devel
manual #724590
allowed to fail manual
t_ubuntu:rolling
 
  External
failed https://desktopqe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/job/beaker-NetworkManager-gitlab-trigger-code-upstream/797/

failed https://desktopqe-jenkins.rhev-ci-vms.eng.rdu2.redhat.com/job/beaker-NetworkManager-gitlab-trigger-code-upstream/797/

05:32:07

 
Name Stage Failure
failed
t_ubuntu:16.04 Test
checking whether to enable maintainer-specific portions of Makefiles... yes
checking whether make supports nested variables... (cached) yes
checking for style of include used by make... GNU
checking for gcc... clang
checking whether the C compiler works... no
configure: error: in `/builds/NetworkManager/NetworkManager/build':
configure: error: C compiler cannot create executables
See `config.log' for more details
ERROR: Job failed: exit code 1