Add the missing align and sector arguments to read_resource_owners() and
add infrastructue for testing 4k storage and initial tests.

The tests for using wrong sector size revealed that
read_resouce_owners() ignores wrong align and sector size. Make it more
strict to be consistent with other APIs.

Changes since v1:
- Update python/example.py (Vojta)
- Improve test infrastructure for testing 4k storage (Amit, Pavel)
- Improve comments and commit messages (Pavel)
- Make the validation code in read_resource_owners more clear (Pavel)
- Add test for read_resource_owners with invalid align value
- Don't override align_size if sector_size is not set
- Reject invalid align in sanlock_read_resource_owners()

v1 was here:
https://lists.fedorahosted.org/archives/list/sanlock-devel@lists.fedorahosted.org/thread/6C44IXV2VTBNDRNWEVH2RCNETPTYMYNW/

Nir Soffer (6):
  python: Add align and sector arguments to read_resource_owners()
  tests: Start tests for 4k storage
  tests: Test wrong sector size with 4k storage
  sanlock: Fail read_resource_owners() with wrong sector size
  tests: Add failing test for invalid align size
  sanlock: Fail read_resource_owners with incorrect align size

 README.dev           |  44 +++++++++++++
 python/example.py    |   2 +-
 python/sanlock.c     |  24 +++++--
 src/resource.c       |  37 ++++++++---
 tests/conftest.py    |  36 +++++++++++
 tests/python_test.py | 148 ++++++++++++++++++++++++++++++++++++++++++-
 tests/util.py        |  34 ++++++----
 tox.ini              |   2 +-
 8 files changed, 299 insertions(+), 28 deletions(-)

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2.17.2