Fix Luarocks on OSX (#4266)

* Debug Luarocks on OSX

* Try installing luarocks first

* Remove debug echoes

(cherry picked from commit ea6df57)

CI/travis.osx.install.sh

@@ -4,7 +4,7 @@ set +e
 shopt -s expand_aliases
 #Removed boost as first item as a temporary workaroud to prevent trying to
 #upgrade to boost version 1.68.0 which has not been bottled yet...
-BREWS="cmake hunspell libzip lua51 pcre pkg-config qt5 yajl ccache pugixml luarocks"
+BREWS="luarocks cmake hunspell libzip lua51 pcre pkg-config qt5 yajl ccache pugixml"
 OUTDATED_BREWS=$(brew outdated)
 
 for i in $BREWS; do