www/node8: copy from www/node, update 8.8.1 -> 8.9.0 (LTS)

[bhughes]

Summary

www/node8: copy from www/node, update 8.8.1 -> 8.9.0 (LTS)

Create a new port for the latest Node.js 8.9.0 LTS release. Update
CONFLICTS for the existing Node.js ports to include the new node8
port and remove non-existent ports.

https://nodejs.org/en/blog/release/v8.9.0/

Test Plan

$ pwd
/usr/ports/www/node8
$ portlint -C
WARN: Makefile: possible use of absolute pathname "/etc/make.conf".
WARN: Makefile: "IGNORE" has to appear earlier.
WARN: Makefile: "ONLY_FOR_ARCHS" has to appear earlier.
0 fatal errors and 3 warnings found.

http://35.176.84.170/data/latest-per-pkg/node8/8.9.0/

[robak]

Minor changes requested.

www/node/Makefile

45

Is there node-devel in ports tree? If not, it shouldn't be here.

www/node4/Makefile

35

Same as above.

www/node6/Makefile

44

Same as above.

www/node8/Makefile

11

Could add a word about it being upstream LTS.

46

Again, node-devel.

[bhughes]

Removing non-existent ports from CONFLICTS

[bhughes]

www/node/Makefile

45

No, there is no node-devel, node010, node012, or iojs in the ports tree anymore. I will remove all references to them now.

[robak]

LGTM.