zpool upgrade return errors to stderr instead of stdout

Signed-off-by: Jacek Feflinski <feflik@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2955
Fix typo in %post scriptlet lines

Missing space made the %post directive be part of the package
%description and not have a %post scriptlet defined.

Signed-off-by: Andy Bakun <github@thwartedefforts.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2961