qa: Add if_modified_since_test04.htt.
qa: Add if_modified_since_test04.htt.

This test together with test01 should guarantee will guarantee that time
conversion is properly performed both on negative and positive GMT
offsets.

Signed-off-by: Sonny Karlsson <c98c6360520d7645c8490dda7ccc4604d8ca1163@lotrax.org>

sujayraaj/monkeyTest,dougsko/monkey,dreamsxin/monkey,sbagmeijer/monkey,WilliamRen/monkey-1,dreamsxin/monkey,monkey/monkey,dreamsxin/monkey,sujayraaj/monkey,dougsko/monkey,sujayraaj/monkeyTest,WilliamRen/monkey-1,sbagmeijer/monkey,sujayraaj/monkey_rtems,sujayraaj/monkey_rtems,sujayraaj/monkeyTest,dougsko/monkey,dreamsxin/monkey,monkey/monkey,sujayraaj/monkey,sujayraaj/monkey,sujayraaj/monkey_rtems,monkey/monkey,sujayraaj/monkey_rtems,sujayraaj/monkeyTest,sujayraaj/monkey_rtems,sujayraaj/monkey,WilliamRen/monkey-1,monkey/monkey,sbagmeijer/monkey,sbagmeijer/monkey,sbagmeijer/monkey,monkey/monkey,WilliamRen/monkey-1,dougsko/monkey,monkey/monkey,dreamsxin/monkey,WilliamRen/monkey-1,dougsko/monkey,sujayraaj/monkey