Duplicated code between ApacheRequest and JdkRequest

[andreoss]

The difference between ApacheRequest and JdkRequest is the anonymous inter classes defining initial Wire for the primary connection (by using either JDK or apache-http client), otherwise two classes are the same and just delegate to BaseRequest.

Proposal:

1. Extract inner Wire implementations as separate classes: JdkWire, ApacheWire
2. Rename BaseRequest to RequestOn

new RequestOn(new JdkWire(...), url);

3. Make JdkRequest & etc aliases for new RequestOn(new JdkWire(..), ..)

Thus:

1. Bug-prone TrustedWire is no longer needed, we can pass SSLContext directly to the initial Wire.
   Solves: ApacheRequest.java:68-70: TrustedWire does not support... #202 TrustedWire changes SSLSocketFactory globally #178
2. Method .through(Class<? extends Wire>), can be replaced by a simple and more obvious composition of different Wire objects, i.e

new RequestOn(new RetryWire(new LoggingWire(new JdkWire(...)))

There is no way to use Wire objects like that now.