Fix huge cache timeouts being clamped too small
Fix huge cache timeouts being clamped too small

AuthVasCacheExpire values larger than UINT_MAX were being clamped to
1193046 or 71582788 seconds when the 'h' or 'm' suffix was used. (Still
a ridiculously large amount of time.)

dell-oss/mod_auth_vas,dell-oss/mod_auth_vas