fix: add retry to snapd client requests #26

Job	Run time
Build concierge	1m 19s
Define spread matrix	5s
Spread (extra-debs)	46s
Spread (extra-packages-config-file)	1m 8s
Spread (extra-snaps)	57s
Spread (juju-model-defaults)	2m 23s
Spread (overrides-env)	7m 51s
Spread (overrides-priority)	1m 15s
Spread (preset-dev)	7m 11s
Spread (preset-k8s)	5m 32s
Spread (preset-machine)	4m 8s
Spread (provider-canonical-k8s)	3m 1s
Spread (provider-google)	53s
Spread (provider-lxd)	2m 51s
Spread (provider-lxd-init-no-bootstrap)	6m 4s
Spread (provider-microk8s)	3m 35s
Spread (provider-none)	36s
Spread (restore)	8m 5s
Release concierge	1m 35s
	59m 15s

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