fix breaking changes in API of boost-1.66.0

[matlo607]

Motivation and Context

fix issue #178

basic_socket_adaptor has now only one template argument.

[boost-1.66.0] basic_socket_acceptor

template<typename Protocol>
class basic_socket_acceptor :
  public socket_base

[boost-1.65.0] basic_socket_acceptor

template<
    typename Protocol,
    typename SocketAcceptorService = socket_acceptor_service<Protocol>>
class basic_socket_acceptor :
  public basic_io_object< SocketAcceptorService >,
  public socket_base

How Has This Been Tested?

I built the project with boost-1.66.0 and passed the unit tests.
My environment:

Distributor ID:	Ubuntu
Description:	Ubuntu 16.04.3 LTS
Release:	16.04
Codename:	xenial

gcc (Ubuntu 5.4.1-2ubuntu1~16.04) 5.4.1 20160904
Copyright (C) 2015 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Types of changes

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).

Checklist:

• It is my own work, its copyright is implicitly assigned to the project and no substantial part of it has been copied from other sources (including Stack Overflow). In rare occasions this is acceptable, like in CMake modules where the original copyright information should be kept.
• I'm using the same code standards as the existing code (indentation, spacing, variable naming, ...).
• I've added tests for my code.
• I have verified whether my change requires changes to the documentation
• My change either requires no documentation change or I've updated the documentation accordingly.
• My branch has been rebased to master, keeping only relevant commits.

[matlo607]

@paoloambrosio, @muggenhor or @konserw : could you please review the pull request ?
Please ignore the commit 1b5ed23, konserw told me it's wrong. I will wait for #184.

[helmesjo]

Any progress on this @matlo607 ?

[matlo607]

If you are talking about the fix for boost-1.66-0 itself, it works.
However, as I mentioned it before, I am waiting for #184 (warning considered as error and not related to this pull request).

[konserw]

Ok, I think you'll need to combine #180 #181 and -werror fix into one PR to get past all checks. It's a pitty I can't change the way it works and @paoloambrosio is not around to make changes

[coveralls]

Coverage remained the same at 63.329% when pulling a5c1211 on matlo607:fix-boost-1.66.0-breaking-changes into 70fa12c on cucumber:master.

[paoloambrosio]

@konserw I can't seem to find any time to review these PRs so I've removed the requirement of having a reviewer for PRs

[konserw]

Merged as part of #189