Add cloud-init paths of the new root in 'after-*' hooks #3383

Job	Run time
detect	1s
build-toolkit	1m 23s
build-matrix (green) / build-os	2m 15s
build-matrix (green) / detect	1s
build-matrix (orange) / build-os	2m 46s
build-matrix (orange) / detect	1s
build-matrix (blue) / detect	1s
build-matrix (blue) / build-os	2m 42s
build-matrix (green) / build-disk	3m 46s
build-matrix (green) / build-iso	1m 46s
build-matrix (orange) / build-iso	2m 29s
build-matrix (orange) / build-disk	4m 14s
build-matrix (blue) / build-disk	2m 2s
build-matrix (blue) / build-iso	1m 53s
build-matrix (green) / test-installer	3m 23s
build-matrix (green) / tests-matrix (test-upgrade)	8m 18s
build-matrix (green) / tests-matrix (test-downgrade)	4m 39s
build-matrix (green) / tests-matrix (test-recovery)	8m 33s
build-matrix (green) / tests-matrix (test-fallback)	10m 4s
build-matrix (green) / tests-matrix (test-fsck)	5m 11s
build-matrix (green) / tests-matrix (test-grubfallback)	5m 0s
build-matrix (orange) / test-installer	4m 47s
build-matrix (blue) / test-installer	4m 4s
build-matrix (blue) / tests-matrix (test-active)	2m 47s
build-matrix (orange) / tests-matrix (test-active)	3m 15s
	1h 25m 21s

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