check_esx_datastore_snmp V2 & V3

Basically I took existing check_esx_datastore_snmp and modified it to be able to work with VMware ESXi, 6.7.0, 15160138 and VMware ESXi, 7.0.2, 17867351

Pre-req for enabling SNMP on ESX was the easiest way found over here (btw, I had to enable V2 at first and then V3 on ESXi, otherwise hashes weren't correct):
https://www.nakivo.com/blog/a-guide-to-esxi-snmp-configuration-for-esxi-monitoring/

Original script link:
https://exchange.nagios.org/directory/Plugins/Operating-Systems/%2A-Virtual-Environments/VMWare/check_esx_datastore_snmp/details

Created: 2021-01-13 Author : Cesar San
based on Mattia Pezzetta work "check_esx_mem_snmp",
based on Thibaut Ploquin work "check_hpux_mem",
based on Alain van der Heiden & Remco Hage works "check_snmp_hpux_mem"
Changes: 2021-01-13 First Release
Changes: 2022-04-08 Powered by Anze Tomazin

USAGE:
V2:
SYNTAX: ./check_esx_datastore_snmp_V2 "

EXAMPLE ./check_esx_datastore_snmp_V2 myhost.mydomain public 90 95 ;datastore must be in format "/vmfs/volumes/60...."

V3
SYNTAX: ./check_esx_datastore_snmp_V3 "

EXAMPLE ./check_esx_datastore_snmp_V3 myhost.mydomain 90 95 ;datastore must be in format "/vmfs/volumes/60...."