CFT/CFR: Update ELK stack to 5.6.6 (D14003)

[John W. O'Brien]

Good day FreeBSD Ports,

I would appreciate review [0] and test of my proposed patch to update
the ELK stack ports to the latest version in the 5.x series.

The maintainer has not yet responded to my request for review.

[0] https://reviews.freebsd.org/D14003

Thank you,

-- 
John W. O'Brien
OpenPGP keys:
    0x33C4D64B895DBF3B
    0x474ABD3C1A7B3F70 (expires 2018-03-14)



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