Improve coherence tests

Signed-off-by: Olaf Kirch <okir@suse.de>
Split large nfs test script into several sub-tests which can also be run individually

Signed-off-by: Olaf Kirch <okir@suse.de>
nfs-tool: added options -u and -g to set the user and group

Signed-off-by: Olaf Kirch <okir@suse.de>
Update TODO

Signed-off-by: Olaf Kirch <okir@suse.de>
Introduce generic __nfs_run functions, and nicknames for all hosts involved

Signed-off-by: Olaf Kirch <okir@suse.de>
nfs_test_lock_coherence: fix how we wait for backgrounded processes

Signed-off-by: Olaf Kirch <okir@suse.de>
Change nfs locking tests to use new async command support in testbus-client

Signed-off-by: Olaf Kirch <okir@suse.de>