EA-1158/CP-5965: Replace minor with UUID

Plus clean up and removal of some obsolete files.

Signed-off-by: Thanos Makatos <thanos.makatos@citrix.com>
Acked-by: Zheng Li <zheng.li@citrix.com>
EA-1158/CP-5965: Document tap-ctl-stats output

Signed-off-by: Thanos Makatos <thanos.makatos@citrix.com>
Acked-by: Zheng Li <zheng.li@citrix.com>
EA-1158/CP-5965: Don't forward READs when in mirroring mode.

Also, fix a tap-ctl-stats bug, plus minor code clean up.

Signed-off-by: Thanos Makatos <thanos.makatos@citrix.com>
Acked-by: Zheng Li <zheng.li@citrix.com>
EA-1158/CP-5965: Don't spam the log for each NBD request.

Signed-off-by: Thanos Makatos <thanos.makatos@citrix.com>
Acked-by: Zheng Li <zheng.li@citrix.com>
Merge branch 'CP-5965' into ea-1158

Signed-off-by: Thanos Makatos <thanos.makatos@citrix.com>
Acked-by: Zheng Li <zheng.li@citrix.com>

GitHub: closes #54 on xapi-project/blktap