Makefile: Add two new headerfiles that are used for the test tools
Update README and mention iscsi-test-cu
New version 1.9.0

The main part of this release is the introduction of a new
CUnit based test tool for iscsi and scsi : iscsi-test-cu
This test tool will replace iscsi-test which will remain but will not
be expanded with any new tests.

Other changes include:
 - Add new CUnit based test tool: iscsi-test-cu to replace iscsi-test
 - Add tests for persistent reservation
 - Autotools updates
 - Add pkgconfig