Delete CASGatewayCookie after successful authentication.

This allows people to reauthenticate after their mod_auth_cas session times out when using gateway mode.
I ran "make check", but it doesn't seem to have run any tests.  It says:

============================================================================
Testsuite summary for mod_auth_cas 1.0.10
============================================================================
# TOTAL: 0
# PASS:  0
# SKIP:  0
# XFAIL: 0
# FAIL:  0
# XPASS: 0
# ERROR: 0
============================================================================


On Mon, 18 Aug 2014, pames <notifications@github.com> wrote:

>
>In src/mod_auth_cas.c:
>
>> @@ -2061,6 +2061,10 @@ int cas_authenticate(request_rec *r)
>>  				return HTTP_INTERNAL_SERVER_ERROR;
>>
>>  			setCASCookie(r, (ssl ? d->CASSecureCookie : d->CASCookie), cookieString, ssl, CAS_S
>ESSION_EXPIRE_SESSION_SCOPE_TIMEOUT);
>> +			/* remove gateway cookie so they can reauthenticate later */
>> +			if (getCASCookie(r, d->CASGatewayCookie)) {
>> +			    setCASCookie(r, d->CASGatewayCookie, "TRUE", ssl, CAS_SESSION_EXPIRE_COOKIE_NOW
>);
>
>"make check" is a build target that you can use which will build the test suite, and
>then you can run it.
>
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