Attach images for 'virtualization' to the Mongolian Handbook,
and resync the Mongolian translation of 'firewalls', 'jails',
and 'virtualization' chapters with the English version.

MFen:
1.76 -> 1.77 mn_MN.UTF-8/books/handbook/firewalls/chapter.sgml
1.13 -> 1.14 mn_MN.UTF-8/books/handbook/jails/chapter.sgml
1.10 -> 1.13 mn_MN.UTF-8/books/handbook/virtualization/chapter.sgml

Submitted by: Ganbold Tsagaankhuu <ganbold at micom.mng.net>