build: display HTTP2 configure --help options

[danbev]

Currently the options available for HTTP2 are not displayed when running
configure --help.

This commit enables the following HTTP2 section to be included in the
help output:

HTTP2:
  Flags that allows you to control HTTP2 features in Node.js

  --debug-http2       build with http2 debug statements on (default is
                      false)
  --debug-nghttp2     build nghttp2 with DEBUGBUILD (default is false)

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• commit message follows commit guidelines

Affected core subsystem(s)

bulid

[danbev]

CI: https://ci.nodejs.org/job/node-test-pull-request/9946/

[danbev]

test/osx failure looks unrelated

console output:

not ok 75 async-hooks/test-callback-error
  ---
  duration_ms: 15.483
  severity: fail
  stack: |-
    start case 1
    end case 1: 102.515ms
    start case 2
    end case 2: 89.404ms
    start case 3
    end case 3: 23.272ms
    Error: test_callback_abort
        at ActivityCollector.initHooks.oninit.common.mustCall (/Users/iojs/build/workspace/node-test-commit-osx/nodes/osx1010/test/async-hooks/test-callback-error.js:36:45)
        at ActivityCollector.oninit (/Users/iojs/build/workspace/node-test-commit-osx/nodes/osx1010/test/common/index.js:509:15)
        at ActivityCollector._init (/Users/iojs/build/workspace/node-test-commit-osx/nodes/osx1010/test/async-hooks/init-hooks.js:182:10)
        at emitInitNative (async_hooks.js:446:43)
        at Object.emitInitScript [as emitInit] (async_hooks.js:349:3)
        at Object.<anonymous> (/Users/iojs/build/workspace/node-test-commit-osx/nodes/osx1010/test/async-hooks/test-callback-error.js:38:17)
        at Module._compile (module.js:549:30)
        at Object.Module._extensions..js (module.js:560:10)
        at Module.load (module.js:483:32)
        at tryModuleLoad (module.js:446:12)
     1: node::Abort() [/Users/iojs/build/workspace/node-test-commit-osx/nodes/osx1010/out/Release/node]
     2: node::Chdir(v8::FunctionCallbackInfo<v8::Value> const&) [/Users/iojs/build/workspace/node-test-commit-osx/nodes/osx1010/out/Release/node]
     3: v8::internal::FunctionCallbackArguments::Call(void (*)(v8::FunctionCallbackInfo<v8::Value> const&)) [/Users/iojs/build/workspace/node-test-commit-osx/nodes/osx1010/out/Release/node]
     4: v8::internal::MaybeHandle<v8::internal::Object> v8::internal::(anonymous namespace)::HandleApiCallHelper<false>(v8::internal::Isolate*, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::HeapObject>, v8::internal::Handle<v8::internal::FunctionTemplateInfo>, v8::internal::Handle<v8::internal::Object>, v8::internal::BuiltinArguments) [/Users/iojs/build/workspace/node-test-commit-osx/nodes/osx1010/out/Release/node]
     5: v8::internal::Builtin_Impl_HandleApiCall(v8::internal::BuiltinArguments, v8::internal::Isolate*) [/Users/iojs/build/workspace/node-test-commit-osx/nodes/osx1010/out/Release/node]
     6: 0x355f759046fd

test/aix failure looks unrelated

console output:

not ok 1655 inspector/test-stop-profile-after-done # TODO : Fix flaky test
  ---
  duration_ms: 0.803
  severity: flaky
  stack: |-
    [test] Connecting to a child Node process
    [test] Testing /json/list
    [err] Debugger listening on ws://127.0.0.1:37192/257c9434-926b-441a-a6c7-6aa733b03d42
    [err] For help see https://nodejs.org/en/docs/inspector
    [err] 
    [out] {}
    [out] 
    [out] {}
    [out] 
    [out] {}
    [out] 
    [out] {}
    [out] 
    [out] {}
    [out] 
    [out] {}
    [out] 
    [out] {}
    [out] 
    [out] {}
    [out] 
    [out] {}
    [out] 
    [out] {}
    [out] 
    [out] {}
    [out] 
    { Error: connect ECONNREFUSED 127.0.0.1:37192
        at Object._errnoException (util.js:1027:13)
        at _exceptionWithHostPort (util.js:1049:20)
        at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1179:14)
      errno: 'ECONNREFUSED',
      code: 'ECONNREFUSED',
      syscall: 'connect',
      address: '127.0.0.1',
      port: 37192 }
    1
  ...

[danbev]

Landed in 343d9dc