v2_03_22
doc: fix typos in documentation
release note: typos
More .gitignore files for an in-source-tree build.
doc: explanation of caching foreign VGs
build: Don't generate symlinks in include/ dir
doc: add some performance info
doc: mention new invalid states in lvmetad_design
o typo
doc: add a little document describing new directory structure.
doc/testing.txt: Fix typo: s/this/thing/.
[unit-test] Push the new unit test framwork.
doc: Fixing VDO document