Fixed an indentation error on one of the assert methods
Default address selection test cases optional

Made some of the default address selection test cases optional:
 - (Unimplemented) Prefer Home Address (mobile IPv6 not a requirement)
 - Source address must be IPv4 mapped if destination is (SIIT not a
   requirement)
 - Source address must not be IPv4 mapped if destination is not (SIIT is
   not a requirement)
Updated the "Choose Same Address" test case.

Updated the IPv6 Default Address Selection test case, which covers Rule
1 of the RFC3484. The test was expecting to ICMPv6 echo replies, but
when using a local interface address, the loopback interface is used.
The equivalent TAHI test expects not to receive any reply and ask the
user to check manually. This is now what the test case does.
Fixed a couple of syntax errors.
Fixed a couple of typos and removed an accidentally added swp file.
Commented the router-only v6LC.5.1.9 test cases, in the end node icmpv6 suite
Commented out the router-only v6LC.5.1.13 test cases in the end node icmpv6 suite