update meta and changelog for 1.6.11
Merlin file
Regularly dump TCP_INFO statistics of outgoing connections

Backport from PR #401 to 1.7.

(cherry picked from commit b88bd91447cb143ae5a6a08ca54a9d5166314d6e)

Conflicts:
	src/libcutil.clib

Closes #401
Add ability to list files for which warning 4 is disabled

Since we'd like to enable the 'fragile pattern matches' warning, but
it's hard to get rid of it in some files (mostly pattern-matching on
`Unix.error`), we need a way to disable to corresponding warning for
these specific files.

This change adds the feature to `myocamlbuild.ml`, not whitelisting any
file for now.
Merge pull request #458 from Incubaid/allow-fragile-pattern-matches

Add ability to list files for which warning 4 is disabled
Remove unneeded merlin dependencies
Merge pull request #454 from mark-christiaens/1.6_merlin

1.6 merlin
Add `B _build/src/node` to `.merlin`
Merge origin/1.6 into 1.6-for-1.7 (using imerge)
Update `.merlin`

Add new source and build directory, and update dependency packages.
Merge pull request #459 from Incubaid/1.6-for-1.7

1.6 for 1.7
Rework TLS configuration
Add new TLS configuration options to sample file
Read & apply configured TLS version & cipher list
Add TLS protocol configuration support to client

This commit also adds a `-tls-version` argument to the CLI interface in
order to select a TLS protocol version when using it.
Add note to Python client about TLS versions

Python 2.x doesn't do anything higher than TLSv1...
CI: Require `ssl-0.4.7` & update seed image
Doc: Add new TLS settings to documentation
Merge pull request #456 from Incubaid/tcpinfo-for-1.7

Regularly dump TCP_INFO statistics of outgoing connections
Enhance TLS key and cert configuration checking

Result of the review in PR #461.

See: https://github.com/Incubaid/arakoon/pull/461#discussion-diff-14136674