Automatic merge from submit-queue

Fix port range checking, port should not be greater than 65535.

When passing flag `--proxy-port-range` to kube-proxy with an invalid range which is greater than 65535, the proxy doesn't exit. That's not what we want.

Should we fix this in v1.3?
/cc @thockin @mikedanese @resouer 

Before fixing:
```
root@vm:/home/paas/zxp# kube-proxy --master=172.16.1.11:8080 --logtostderr=false --log-dir=/home/user/log/kube --proxy-port-range=65536-65599 &
[6] 6671
root@vm:/home/paas/zxp# ps -ef | grep kube-proxy
root      6671 13507  0 03:48 pts/1    00:00:00 kube-proxy --master=172.16.1.11:8080 --logtostderr=false --log-dir=/home/user/log/kube --proxy-port-range=65536-65599
```

After:
```
root@vm:/home/paas/zxp# kube-proxy --master=172.16.1.11:8080 --logtostderr=false --log-dir=/home/user/log/kube --proxy-port-range=65536-65599 &
[6] 6725
root@vm:/home/paas/zxp# invalid argument "65536-65599" for --proxy-port-range=65536-65599: "65536-65599" is not a valid port range: the port range cannot be greater than 65535: 65536-65599
..............
[6]+  Exit 2                  kube-proxy --master=172.16.1.11:8080 --logtostderr=false --log-dir=/home/user/log/kube --proxy-port-range=65536-65599
```
```
root@vm:/home/paas/zxp# kube-proxy --master=172.16.1.11:8080 --logtostderr=false --log-dir=/home/user/log/kube --proxy-port-range=6000-65599 &
[6] 6732
root@vm:/home/paas/zxp# invalid argument "6000-65599" for --proxy-port-range=6000-65599: "6000-65599" is not a valid port range: the port range cannot be greater than 65535: 6000-65599
..............
[6]+  Exit 2                  kube-proxy --master=172.16.1.11:8080 --logtostderr=false --log-dir=/home/user/log/kube --proxy-port-range=6000-65599
```