Fix and improves

[Coldwings]

We have dig in PhotonLibOS, and now provides bug fix and features

Fix:

• ExpireContainer<T> insert should keep in protect by lock, in case of using in multi-vcpu condition.
• libaio_adaptor may stuck if io_submit failed, but no more libaio actions submitted.

Improves:

• RingChannel now has better waiting strategy, able to reduce send-recv latency.
  • Executor, WorkPool are now using RingChannel
• URL add new method, able to get host path without port part
• Hook of photon thread stack allocation, to help using custom allocator
  • Some GC framework needs to mark memory usage, here is a way to add such kind of mark. Making Photon work with GC #150

[CLAassistant]

All committers have signed the CLA.