End-to-end test of EasyBuild in different distros

add `dependency_names` method to `EasyConfig` class to get set of names of (direct) dependencies #110

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Run time

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Job	Run time
End-to-end test (centos-7.9)	6m 59s
End-to-end test (centos-8.5)	8m 18s
End-to-end test (fedora-36)	7m 22s
End-to-end test (opensuse-15.4)	7m 53s
End-to-end test (rockylinux-8.8)	7m 3s
End-to-end test (rockylinux-9.2)	9m 28s
End-to-end test (ubuntu-20.04)	9m 22s
End-to-end test (ubuntu-22.04)	9m 35s
	1h 6m 0s