Remove assoc

[jhert0]

This change is

[iphydf]

Also remove the option from other/travis/toxcore-script.

[iphydf]

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Reviewed 10 of 10 files at r1.
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[nurupo]

I grepped the repository to see if all assoc things were removed and apparently there are variables called assoc4 and assoc6 in the DHT.h, but they were added before any assoc.[c|h] existed and seem to be used just to store IP addresses 9de2953, i.e. irrelevant to the assoc we are trying to remove.

[nurupo]

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Reviewed 10 of 10 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[iphydf]

@endoffile78 can you rebase this and fix the conflict? (Sorry about that)

[iphydf]

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Reviewed 2 of 2 files at r2.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable