Remove the "magic" StartChild, StopChild and LoadVCL test cases. Instead,

Remove the "magic" StartChild, StopChild and LoadVCL test cases.  Instead,
Case.pm now has init() and fini() (which can of course be overloaded by
individual test classes) which start / stop the child, and load a VCL
script if the particular test class being run provides one.  In addition,
fini() will revert to the initial VCL script ("boot") if a custom script
was loaded by init().

git-svn-id: svn+ssh://projects.linpro.no/svn/varnish/trunk@1512 d4fa192b-c00b-0410-8231-f00ffab90ce4