Bump systemd service timeout to allow enough time for Jenkins to start #109

Job	Run time
Run Tests / Unit tests	47s
Run Tests / Integration tests (lxd) / Integration tests (lxd) (bionic, agent)	12m 41s
Run Tests / Integration tests (lxd) / Integration tests (lxd) (bionic, basic)	8m 59s
Run Tests / Integration tests (lxd) / Integration tests (lxd) (bionic, nrpe)	9m 32s
Run Tests / Integration tests (lxd) / Integration tests (lxd) (bionic, website)	27m 57s
Run Tests / Integration tests (lxd) / Integration tests (lxd) (focal, agent)	10m 51s
Run Tests / Integration tests (lxd) / Integration tests (lxd) (focal, basic)	8m 40s
Run Tests / Integration tests (lxd) / Integration tests (lxd) (focal, nrpe)	13m 21s
Run Tests / Integration tests (lxd) / Integration tests (lxd) (focal, website)	9m 33s
	1h 42m 21s

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