Fix bug in ip-in-use test

Need grep -wF instead of grep -w for IP test to avoid spurious match
against broadcast address in ifconfig output.

usr/local/share/bastille/clone.sh

@@ -68,7 +68,7 @@ validate_ip() {
                     error_exit "Invalid: (${TEST_IP})"
                 fi
             done
-            if ifconfig | grep -qw "${TEST_IP}"; then
+            if ifconfig | grep -qwF "${TEST_IP}"; then
                 warn "Warning: IP address already in use (${TEST_IP})."
             else
                 info "Valid: (${IP})."