build: add vdo configuration option --with-vdo=

build: add vdo configuration option --with-vdo=

Checks whether VDO support is enabled.
Detects presence of 'vdoformat' tool which is required for to format VDO pool.

ATM build of VDO is NOT automatically enabled (None is default).
To enable build of LVM with VDO support use:

configure --with-vdo=internal

TODO: Maybe future version may switch to link some small VDO library for formating
(would require linking and package dependency).