[Bug 215881] mlslabel had "" value, instead of none

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215881

            Bug ID: 215881
           Summary: mlslabel had "" value, instead of none
           Product: Base System
           Version: 11.0-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: apenner.it at gmail.com

Description:
zfs get mlslabel return "" value, instead of "none" defined in
sys/cddl/contrib/opensolaris/uts/common/sys/fs/zfs.h 
at 319 
>> #define	ZFS_MLSLABEL_DEFAULT	"none"

Example (FreeBSD 11):
[root at freebsd /]# zfs get  mlslabel pool1/fs/fs1
NAME          PROPERTY  VALUE     SOURCE
pool1/fs/fs1  mlslabel            -

Example (OmniOS):
[root at unknown ~]# zfs get mlslabel pool1/fs/fs1
NAME          PROPERTY  VALUE     SOURCE
pool1/fs/fs1    mlslabel        none    default

Example (Linux):
[root at localhost /home]# zfs get mlslabel pool1/fs/fs1
NAME          PROPERTY  VALUE     SOURCE
pool1/fs/fs1    mlslabel        none    default

Effect:
it's broke shell scripts which expect some value or "none" in third (VALUE)
field.
In others OS (Illumous, Linux, SunOS) it's has default value - "none"

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