release-19.4:Backport!3128

Merged Andrey Vertiprahov requested to merge cherry-pick-95dd6594 into release-19.4

noc/noc#1181 Alstec.24xx.get_inventory. Fallback to CLI when unknown SNMP part_no.

See merge request !3128 (merged)

(cherry picked from commit 95dd6594)

11af5178 Alstec.24xx.get_inventory. Fallback to CLI when unknown SNMP part_no.

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