traceroute: fix alternate name

traceroute6 for the name is misleading and will interfere
with traceroute6 in iputils making an alternate link to
the traceroute6 binary, so we change the name to traceroute.

Signed-off-by: Joe Slater <jslater@windriver.com>
Signed-off-by: Joe MacDonald <joe.macdonald@windriver.com>