Add more logging to RequestRedirectHandler when session id is missing in request

Summary:
Add better error reporting in case a request comes in that contains no session
id.

Test Plan:
```
$ mvn clean install
...
[INFO] Reactor Summary:
[INFO]
[INFO] selendroid ......................................... SUCCESS [  0.123 s]
[INFO] android-driver-app ................................. SUCCESS [  2.377 s]
[INFO] selendroid-server-common ........................... SUCCESS [  1.005 s]
[INFO] selendroid-server .................................. SUCCESS [ 15.105 s]
[INFO] selendroid-grid-plugin ............................. SUCCESS [  0.595 s]
[INFO] selendroid-common .................................. SUCCESS [  0.834 s]
[INFO] selendroid-standalone .............................. SUCCESS [ 16.157 s]
[INFO] selendroid-client .................................. SUCCESS [  0.541 s]
[INFO] selendroid-test-app ................................ SUCCESS [  4.496 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
```

- Ran one of the Facebook e2e tests

Reviewers: mkonicek

Reviewed By: mkonicek

Differential Revision: https://reviews.facebook.net/D29193