Avoid shadowing index(3)

A classic gotcha of the standard C library is that its unwise to call any
variable 'index' because it will shadow the standard string library
function index(3).  This can cause warnings from cppcheck amongst others,
and it also means that if the variable is removed you tend to get confusing
type errors (or sometimes nothing at all) instead of a nice simple "name is
not defined" error.

Strictly speaking this only occurs if <string.h> is included, but that
is so common that as a rule it's best to just avoid it always.  We
have a number of places which hit this trap, so rename variables and
parameters to avoid it.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

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