SNMP::Mock: add support for multi-line STRING
use File::Glob::glob() for portability

This commit reverts commit:7d1b3dbbae71c5f756197ef4497bed70eccf6dc5
CORE::glob() on Win32 acts not like expected. File::Glob::glob()
mimic UNIX glob on Windows, that's what we want.

closes: #2006

see:
  commit:c3232248daf3db903defac7a6bed04a7a3c7be42
  commit:303f0ab94faa7ad9b708f0acbb1fe2135ac1ca42

Reported-by: Tomás Abad <tabadgp@gmail.com>
restore the missing _getInstallDate()

fix the merge of commit:ff4df42418c720c7b0f7da1336700de87bff191d in
master.
fix: getnameinfo()
fix the getnameinfo()

tested with IPv4 and IPv6 on Windows and Linux.

Reported-by: Tomás Abad <tabadgp@gmail.com>
Merge branch 'master' into master+cli-with+better-model-support