tar error if tests are an NFS mount

[concaf]

Steps to reproduce:

• Mount the adb-tests directory to the machine running the tests over NFSv3.
• In adb-tests/cdrage-atomicapp-ci run make clean-all install docker.
• It might run the first time, but from the next time the test it run, it starts failing like the following, even with sudo make ...

...
  ##########
  INSTALLING ATOMIC CLI
  ##########

--2016-02-26 09:20:45--  https://github.com/projectatomic/atomic/archive/v1.8.tar.gz
Resolving github.com (github.com)... 192.30.252.131
Connecting to github.com (github.com)|192.30.252.131|:443... connected.
HTTP request sent, awaiting response... 302 Found
Location: https://codeload.github.com/projectatomic/atomic/tar.gz/v1.8 [following]
--2016-02-26 09:20:46--  https://codeload.github.com/projectatomic/atomic/tar.gz/v1.8
Resolving codeload.github.com (codeload.github.com)... 192.30.252.160
Connecting to codeload.github.com (codeload.github.com)|192.30.252.160|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 800198 (781K) [application/x-gzip]
Saving to: ‘atomic.tar.gz’

100%[===================================================================================================================================>] 800,198      543KB/s   in 1.4s   

2016-02-26 09:20:49 (543 KB/s) - ‘atomic.tar.gz’ saved [800198/800198]

atomic-1.8/
atomic-1.8/.gitignore
tar: atomic-1.8/.gitignore: Cannot change ownership to uid 0, gid 0: Operation not permitted
atomic-1.8/Atomic/
atomic-1.8/Atomic/Export.py
tar: atomic-1.8/Atomic/Export.py: Cannot change ownership to uid 0, gid 0: Operation not permitted
atomic-1.8/Atomic/Import.py
tar: atomic-1.8/Atomic/Import.py: Cannot change ownership to uid 0, gid 0: Operation not permitted
atomic-1.8/Atomic/__init__.py
tar: atomic-1.8/Atomic/__init__.py: Cannot change ownership to uid 0, gid 0: Operation not permitted
atomic-1.8/Atomic/atomic.py
tar: atomic-1.8/Atomic/atomic.py: Cannot change ownership to uid 0, gid 0: Operation not permitted
atomic-1.8/Atomic/diff.py
...
...