Allow the nodemap to contain multiple nodes for mibs like IF-MIB

In the IF-MIB, "interfaces" and "ifMIBObjects" both contain
significant subtrees.  Allow nodemap to contain a comma-separated
list of nodes, to handle MIBs like this.
make test: bail out if netstat not found.
cpu_pstat.c: fix missing break(s) in switch statement
Merge branch 'V5-4-patches' into V5-5-patches

* V5-4-patches:
  cpu_pstat.c: fix missing break(s) in switch statement
Merge branch 'V5-5-patches' into V5-6-patches

* V5-5-patches:
  cpu_pstat.c: fix missing break(s) in switch statement
BUG #a2551: fix non-sequential cpu numbers on HP-UX.
Thanks to Dave Olker.
Merge branch 'V5-4-patches' into V5-5-patches

* V5-4-patches:
  BUG #a2551: fix non-sequential cpu numbers on HP-UX. Thanks to Dave Olker.
Merge branch 'V5-5-patches' into V5-6-patches

* V5-5-patches:
  BUG #a2551: fix non-sequential cpu numbers on HP-UX. Thanks to Dave Olker.
T071com2sec6_simple: use private host to check ipv6 address resolution to make sure we get the expected result
HP UX, CPU statistics: Fix an invalid pointer dereference

See also commit 0034581deb3e676d328824c87637aaca31850c6a.
Merge branch 'V5-4-patches' into V5-5-patches

* V5-4-patches:
  HP UX, CPU statistics: Fix an invalid pointer dereference
Merge branch 'V5-5-patches' into V5-6-patches

* V5-5-patches:
  HP UX, CPU statistics: Fix an invalid pointer dereference
Merge branch 'V5-4-patches' of ssh://git.code.sf.net/p/net-snmp/code into V5-4-patches
AIX: Fix a few compiler warnings

Avoid that the following compiler warnings are reported:
- Assignment discards const.
- Unused local variable.
- Mismatch between format string and argument list.

Also correct the indentation of two Solaris-specific code statements.
Merge branch 'V5-4-patches' into V5-5-patches

* V5-4-patches:
  AIX: Fix a few compiler warnings
  Allow the nodemap to contain multiple nodes for mibs like IF-MIB
Merge branch 'V5-5-patches' into V5-6-patches

* V5-5-patches:
  AIX: Fix a few compiler warnings
  Allow the nodemap to contain multiple nodes for mibs like IF-MIB
adjust debug token for netsnmp_sockaddr_in6_2
Add RFC 7257 vpls mibs
Updated IANA mibs
Updated DOCS-IF-MIB reference