netsnmpd: Update to version 5.9.3

netsnmpd: Update to version 5.9.3

- Update from version 5.9.1 to 5.9.3
- Version 5.9.4 exists but it is indicated that SNMP over TLS and/or DTLS is not
   functioning properly with various versions of OpenSSL. However I could not find which
   versions mentioned in the News or Changelog. The problem will be fixed in a future
   version. There are no CVE fixes in 5.9.4, only a relatively few bug fixes so I
   decided to wait for the fixed version in case there are users using TLS with SNMP.
- Update of rootfile
- 6 CVE fixes in 5.9.3
- Changelog
    5.9.3
	    security:
	      - These two CVEs can be exploited by a user with read-only credentials:
	          - CVE-2022-24805 A buffer overflow in the handling of the INDEX of
	            NET-SNMP-VACM-MIB can cause an out-of-bounds memory access.
	          - CVE-2022-24809 A malformed OID in a GET-NEXT to the nsVacmAccessTable
	            can cause a NULL pointer dereference.
	      - These CVEs can be exploited by a user with read-write credentials:
	          - CVE-2022-24806 Improper Input Validation when SETing malformed
	            OIDs in master agent and subagent simultaneously
	          - CVE-2022-24807 A malformed OID in a SET request to
	            SNMP-VIEW-BASED-ACM-MIB::vacmAccessTable can cause an
	            out-of-bounds memory access.
	          - CVE-2022-24808 A malformed OID in a SET request to
	            NET-SNMP-AGENT-MIB::nsLogTable can cause a NULL pointer dereference
	          - CVE-2022-24810 A malformed OID in a SET to the nsVacmAccessTable
	            can cause a NULL pointer dereference.
	      - To avoid these flaws, use strong SNMPv3 credentials and do not share them.
	        If you must use SNMPv1 or SNMPv2c, use a complex community string
	        and enhance the protection by restricting access to a given IP address
		range.
	      - Thanks are due to Yu Zhang of VARAS@IIE and Nanyu Zhong of VARAS@IIE for
	        reporting the following CVEs that have been fixed in this release, and
	        to Arista Networks for providing fixes.
	    misc:
	      - Snmp-create-v3-user: Fix the snmpd.conf path   @datadir@ is
		expanded in ${datarootdir} so datarootdir must be set before
		@datadir@ is used.
	    general: Many bug fixes
    5.9.2
	    skipped due to a last minute library versioning found bug -- use 5.9.3 instead

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>