Use the socket portability layer when needed.

Summary: This switches the places in Folly that need to explicitly reference the socket portability implementation to do exactly that.

Reviewed By: yfeldblum

Differential Revision: D3299984

fbshipit-source-id: 57cd8ebe66c9055aba66581a8c0fcf6c125d96f9

fix HHWheelTimer comment typo

Summary: Noticed this while reading the code.

Reviewed By: yfeldblum

Differential Revision: D3648565

fbshipit-source-id: c00940e5ce91fbc7e5cc6c42e35c5deee3e0bf65

Add a const getter for X509 used in handshake (server-side)

Summary:
Similar to other getters such as getSSLCertSize, but returns a const X509*.
This may be useful to get cert parameters after handshake is complete
(or in error).

Reviewed By: yfeldblum

Differential Revision: D3636598

fbshipit-source-id: 98f0e2987de53d6343541ef0ed588f9ad18390cd

Handle MSVC's preprocessor oddities in the SharedMutex test

Summary: MSVC needs a bit more glue to expand the varargs.

Reviewed By: yfeldblum

Differential Revision: D3614681

fbshipit-source-id: 901d8c5138b1d2d28434c51bdff31f6d21f26681

Deprecate dynamic::dynamic(std::initializer_list<dynamic>)

Summary:After DR95 the single braces dispatch to the copy constructor
(http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_defects.html#1467),
so it is not possible anymore to initialize a singleton dynamic array
using the braces syntax. The initializer list constructor already had
a special case for empty lists, which unconditionally called the
default constructor if defined.

This diff deprecates the braces syntax and defines the following alternative:
```
dynamic empty = dynamic::array;
dynamic a = dynamic::array(1, 2, "foo");
```

Reviewed By: luciang, yfeldblum

Differential Revision: D3013423

fb-gh-sync-id: a0cf09dfd96e9806044f7c3bf3592c637a9bc932
shipit-source-id: a0cf09dfd96e9806044f7c3bf3592c637a9bc932

Bump version to 57:0

Bump version to 56:0

Bump version to 55:0

Bump version to 54:0

Bump version to 53:0