net-mgmt/netdata: Update to 1.21.1

Update netdata to 1.21.1

Move cloud related changes to extra-patch
Additional patch for cloud added
Remove "Nodes" button when cloud support is disabled

Source:
https://git.progress-linux.org/distributions/engywuck-backports/packages/netdata/tree/debian/patches/debian/0011-remove-login.patch to extra-patch

Tested on FreeBSD 13.0-CURRENT #0 r358620 (AMD64)

Poudriere OK 12.1-RELEASE

Reset maintainer to ports@ after repeated maintainer timeout from mmokhi@.

Over Daniel's submission, make libuv an unconditional requisite,
and also json-c because netdata's configure.ac cannot disable it and
might pick it up, leading to unregistered dependencies if json-c is
available at compile time (in, for instance, portmaster or live systems).

Remove the JSON option.

PR: 245603
Submitted by: Daniel Engberg <daniel.engberg.lists@pyret.net>
Approved by: maintainer timeout (mmokhi@, 15 days, resetting)