Fix pacman.list_upgrades for new python_shell default. #24490
Merged
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2015.5 sets the default for python_shell to False, so the pipe used in
pacman.list_upgrades no longer works. The egrep invocation after the
pipe has the effect of skipping the first output line, which is an
informational message. Instead of piping to egrep, we simply skip the
first line of output when parsing for the available upgrades.