http: Fix overlooked agent.globalAgent export

Noticed by @bnoordhuis in https://github.com/joyent/node/pull/5991#discussion_r5575946
https: fix default port

https.get('https://github.com/') should use port 443, not 80.
test: Move test-http-default-port from disabled to simple
build: embed the mdb_v8.so into the binary

This builds and includes the mdb_v8.so in the binary of node so mdb
can be sure to always use the latest version
build: fix ia32 sunos, elfwrap only needs -64
doc: add a missing word in streams doc

Ignore encoding *if* chunk is a buffer
repl: Add 'smalloc' to list of known modules
tls_wrap: DRY ClientHelloParser

Share ClientHelloParser code between `tls_wrap.cc` and `node_crypto.cc`.

fix #5959
tls: asynchronous SNICallback

Make ClientHelloParser handle SNI extension, and extend `_tls_wrap.js`
to support loading SNI Context from both hello, and resumed session.

fix #5967
crypto: fix signed/unsigned comparison warning

The type of the expression `(uint16_t) server_names_len + 2` gets
implicitly widened to int. Change the type of server_names_len to
uint32_t to avoid the following warnings:

    ../../src/node_crypto_clienthello.cc:144: warning: comparison
    between signed and unsigned integer expressions
    ../../src/node_crypto_clienthello.cc:146: warning: comparison
    between signed and unsigned integer expressions
src: fix WITH_GENERIC_STREAM() type check bug

The handle object was checked against the wrong constructor template.
Put another way, it was unwrapped as the wrong StreamWrap type.
process_wrap: omit superfluous Number creation

Don't create a superfluous Number object, just use the version of
v8::Object::Get() that takes an unsigned int. Convert the index to
unsigned int while we're here.