util: honor anchored names when searching for executables
I got bit in a debugging session on an uninstalled libvirtd; the code tried to call out to the installed $LIBEXECDIR/libvirt_iohelper instead of my just-built version. So I set a breakpoint and altered the binary name to be "./src/libvirt_iohelper", and it still failed because I don't have "." on my PATH. According to POSIX, execvp only searches PATH if the name does not contain a slash. Since we are trying to mimic that behavior, an anchored name should be relative to the current working dir. This tightens existing behavior, but most callers already pass an absolute name or a name with no slashes, so it probably won't be noticeable. * src/util/util.c (virFindFileInPath): Anchored relative names do not invoke a PATH search.
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