t: restui: implement various attack cases
t: restui: implement various attack cases

Test behaviour of server for malformed inputs:

1. test malformed session ID
2. test malformed URI in GET
3. simple XSS attempt

Signed-off-by: Jan Viktorin <3eab6ac54c005c4408f608556a6663b7f2abede7@fit.vutbr.cz>

BeeeOn/server,BeeeOn/server,BeeeOn/server,BeeeOn/server