Version 1.5.0

This new release fixes some problems with mkzonefs and improves the test suite.
In more details:

• mkzonefs:
  • Improved zone reset handling, forcing an all zone reset, always.
  • Use O_EXCL mode flag to open a device file to avoid formatting a device in use.
  • Fix make install directive
  • Add the new make rpm directive
• Test suite:
  • New zio tool to execute IO operations of various types using various flags
  • Fix stale data access when running tests
  • zonefs-tests-nullblk.sh improvements (new options)
  • Add test cases related to using zonefs files as swap files
  • Various other minor improvements.