Fixed SpnegoWebflowConfigurer to use the evaluateClientRequest as documented

[miller79]

Changes include the following:

• Added conditional logic when mixedModeAuthentication is false to use
  startSpnegoAuthenticate flow. Otherwise it will use
  evaluateClientRequest.
• Modified createEvaluateSpnegoClientAction to be equivlent to the other
  Spnego actions on failure which is
  CasWebflowConstants.STATE_ID_VIEW_LOGIN_FORM

Since this change fixes the documentation listed out here, this change re-enables the functionality which may cause unexpected results to those using the defaults. Some of those properties are the following:

• cas.authn.spnego.hostNameClientActionStrategy
• cas.authn.spnego.hostNamePatternString
• cas.authn.spnego.mixedModeAuthentication
• cas.authn.spnego.ipsToCheckPattern

I have done my best to ensure as few changes are affected as possible.

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