Add OpenVPN probe

This adds support for OpenVPN status probe which uses OpenVPN's
management interface (configured via 'management 127.0.0.1 1234' in
OpenVPN's config).

The output looks as follows:
...
  OpenVPN
    127.0.0.1:1234
      status: CONNECTED
      tunnel: 10.8.0.15
      remote: 144.76.43.77:1194
    localhost:4242
      status: management interface incompatible
    127.0.0.1:4444
      status: management interface unavailable
...

We show tunnel's IP (if available) as well as remote (OpenVPN server
itself) address/port in addition to general connection status. If
management interface is unavailable it's reported as such. If we've
managed to establish connection with a given management interface but
are unable to obtain expected information than we report this
incompatibility as well.

Related: SYS#2655
Change-Id: I4493e19b9a09dcebd289457eacd1719f7f8cc31c
diff --git a/configure.ac b/configure.ac
index d98de89..44a040c 100644
--- a/configure.ac
+++ b/configure.ac
@@ -42,6 +42,7 @@
 PKG_CHECK_MODULES(LIBOSMOVTY, libosmovty >= 0.11.0)
 PKG_CHECK_MODULES(LIBOSMOCTRL, libosmoctrl >= 0.11.0)
 PKG_CHECK_MODULES(LIBOSMOGSM, libosmogsm >= 0.11.0)
+PKG_CHECK_MODULES(LIBOSMONETIF, libosmo-netif >= 0.4.0)
 PKG_CHECK_MODULES(LIBMNL, libmnl)
 dnl FIXME: bump to 1.10.0 once it's available on build slaves and remove workaround from osysmon_ping.c
 PKG_CHECK_MODULES(LIBOPING, liboping >= 1.9.0)