Add wrapper for strtol() function. Include unit tests.
Signed-off-by: NCarlos L. Torres <carlos.torres@rackspace.com>
Message-Id: <07199f1c0ff3892790c6322123aee1e92f580550.1437346779.git.carlos.torres@rackspace.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>