MFC r333552,333558-333568,333573,338568-338569,339275,339278,339294,340037,

r349720,356228:

r333552 (des):

Upgrade Unbound to 1.6.0. More to follow.

r333558 (des):

Upgrade Unbound to 1.6.1. More to follow.

r333559 (des):

Upgrade Unbound to 1.6.2. More to follow.

r333560 (des):

Upgrade Unbound to 1.6.3. More to follow.

r333561 (des):

Upgrade Unbound to 1.6.4. More to follow.

r333562 (des):

Upgrade Unbound to 1.6.5. More to follow.

r333563 (des):

Upgrade Unbound to 1.6.6. More to follow.

r333564 (des):

Upgrade Unbound to 1.6.7. More to follow.

r333565 (des):

No reason to keep this around.

r333566 (des):

Upgrade Unbound to 1.6.8. More to follow.

r333567 (des):

Upgrade Unbound to 1.7.0. More to follow.

r333568 (des):

Upgrade Unbound to 1.7.1.

r333573 (des):

Rename all Unbound binaries and man pages from unbound* to local-unbound*.

PR: 222902

r338568 (des):

Upgrade Unbound to 1.7.2. More to follow.

r338569 (des):

Upgrade Unbound to 1.7.3. More to follow.

r339275 (des):

Upgrade Unbound to 1.8.0. More to follow.

r339278 (des):

Upgrade to 1.8.1.

r339294 (des):

Try harder to sanitize the environment before running configure.
Remove a workaround for older Unbound versions that used sbrk.

r340037 (des):

Merge upstream r4932: turn so-reuseport option off by default.

r349720 (des):

Upgrade Unbound to 1.9.2.

MFC r356228 (cy):
MFV r356143:

Update unbound 1.9.2 --> 1.9.6.

Security: CVE-2017-15105 (fixed by 1.6.7)

		CVE-2019-18934 (fixed by 1.9.5)