brew: guard --help with nil cmd.
brew.rb: handle single usage flag case.
tomcat 8.0.9 stable
tomcat: update 8.0.9 bottle.

Closes #30456.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
add skip build apache2 module option
hide apache2 module caveats if not build it
remove trailing whitespace
inline apache2 module caveats
passenger: update 4.0.45 bottle.
tomcat: update 8.0.9 bottle.