Zabbix

 - [ZBX-3490] Add lvm devices support to vfs.dev.read and
   vfs.dev.write .
 - this commit also enables support for parameters with full path to
   device when using vfs.dev.read and vfs.dev.write
 - example usage:
   vfs.dev.read[mapper/VolGroup01-LogVol00,sectors]
   vfs.dev.read[VolGroup01/LogVol00,sectors]
   vfs.dev.read[/dev/sda,operations]