Fix cpu limit to report cpu shares.
It is currently treating shares as millicores.

Changed 'CPU Limit 1.024 cores' to 'CPU shares 1024 shares'.

Docker-DCO-1.1-Signed-off-by: Rohit Jnagal <jnagal@google.com> (github: rjnagal)
Merge pull request #124 from rjnagal/cpumask

Fix cpu limit to report cpu shares.