Merge pull request #299 from CESNET/v5.3.0 #245

Job	Run time
check / editor-config	8s
check / clang-checks	1m 40s
build-os-matrix	3s
make-tests (oraclelinux:9) / tests	1m 49s
build (oraclelinux:9) / build	2m 4s
rpm-build (oraclelinux:9) / rpm-build	5m 47s
ipfix-elements-check / ipfix-elements-checks	38s
rpm-install (oraclelinux:9) / rpm-install	1m 20s
	13m 29s

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