bug#18681: cp Specific fail example

[Paul Eggert]

I do not observe the symptoms that you report.  See below.  My guess is that 
you've aliased 'cp' to 'cp -i', which is probably a mistake.

$ git clone git://dpdk.org/dpdk
Cloning into 'dpdk'...
remote: Counting objects: 16249, done.
remote: Compressing objects: 100% (3976/3976), done.
remote: Total 16249 (delta 12964), reused 15109 (delta 12122)
Receiving objects: 100% (16249/16249), 12.79 MiB | 1.20 MiB/s, done.
Resolving deltas: 100% (12964/12964), done.
Checking connectivity... done.
$ cd dpdk
$ git checkout -b map_v1.7.1 v1.7.1
Switched to a new branch 'map_v1.7.1'
$ pwd
/tmp/d/dpdk
$ cd ..
$ wget http://dpdk.org/browse/dpdk/snapshot/dpdk-1.7.1.tar.gz
--2014-10-10 11:15:44--  http://dpdk.org/browse/dpdk/snapshot/dpdk-1.7.1.tar.gz
Resolving dpdk.org (dpdk.org)... 92.243.14.124
Connecting to dpdk.org (dpdk.org)|92.243.14.124|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [application/x-gzip]
Saving to: ‘dpdk-1.7.1.tar.gz’

    [                   <=>                 ] 8,281,609   1.17MB/s   in 7.5s

2014-10-10 11:15:52 (1.06 MB/s) - ‘dpdk-1.7.1.tar.gz’ saved [8281609]

$ tar -xf dpdk-1.7.1.tar.gz
$ cp -f -r dpdk-1.7.1/* dpdk/
$