Fix pvs/lvs/vgs failing due empty VG spotted in metadata when under load.

Update boom to bug fix release 1.2.

boom: Fix traceback in error path.
boom: Improve error path handling with --debug.

Add allow_mixed_block_sizes into lvm.conf.
Update boom to version 1.1.

No validation for thin pools not used by lvm,
Add support for VDO in blkdeactivate script.

Bug fix release.
See WHATS_NEW file for details.

Fix failing pvs with locking_type 4.

More limited prohibition of raid reshapes.

Fix bug where headers of incorrect device could be overwritten.

Prevent reshape of stacked LVs.

Fix dmeventd failing to resize thin pool stacked on top of raid LVs.

Fix lvmetad shutdown and avoid lenghty timeouts when rebooting system.
Change allow_mixed_block_sizes default to 1.

Prevent creating VGs with PVs with different logical block sizes.
Pvmove runs in exlusively activating mode for exclusively active LVs.
Activate thin-pool layered volume as 'read-only' device.
Enhance validation for thin and cache pool conversion and swapping.

Improve removal of cached devices.
Synchronize with udev when dropping snapshot.
Add missing device synchronization point before removing pvmove node.
Correctly set read_ahead for LVs when pvmove is finished.
Fix metadata writes from corrupting with large physical block size.

Fix cluster conversions from linear to mirror.
Report no_discard_passdown for cache LVs with lvs -o+kernel_discards.
Prevent shared active mirror LVs with lvmlockd.
Parsing of cache status understand no_discard_passdown.

Fix change of monitoring in clustered volumes.
Improve -lXXX%VG modifier which improves cache segment estimation.
Add synchronization with udev before removing cached devices.
Fix missing growth of _pmspare volume when extending _tmeta volume.
Automatically grow thin metadata, when thin data gets too big.