LU-13818 build: use libsnmp-dev instead of libsnmp30

LU-13818 build: use libsnmp-dev instead of libsnmp30

Installing libsnmp-dev will pull in the correct libsnmpXX.
By depending on the libsnmp-dev we can install on
ubuntu 20.04 which is libsnmp35

Lustre-change: https://review.whamcloud.com/39506
Lustre-commit: af2f77633bf7b12d6ca1ab606ff90cf1ee58107a

Change-Id: Ib921ac35e06149ba88fa8e39b9a0980deb94acf2
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Reviewed-by: Sebastien Buisson <sbuisson@ddn.com>
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/39679
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>