fix to decode JSON from response to get_facts #505

Job	Run time
Unit Tests (Galaxy) (junipernetworks/junos)	1m 7s
build-import-collection (junipernetworks/junos)	20s
Sanity Tests (junipernetworks/junos)	2m 2s
Sanity Tests (juniper/device)	2m 16s
Unit Tests (Source) (juniper/device)	39s
build-import-collection (juniper/device)	27s
Unit Tests (Galaxy) (juniper/device)	13s
Unit Tests (Source) (junipernetworks/junos)	1m 29s
changelog / Requires changelog	11s
ansible-lint (junipernetworks/junos) / Ansible Lint	35s
ansible-lint (juniper/device) / Ansible Lint	27s
all_green	2s
	9m 48s

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