Don't run tests when install modules

Author: nyalldawson

.ci/travis/code_layout/before_install.sh

@@ -17,4 +17,4 @@ pip install autopep8 nose2 mock termcolor
 
 export PERL_MM_USE_DEFAULT=1
 export PERL_EXTUTILS_AUTOINSTALL="--defaultdeps"
-perl -MCPAN -e 'install App::Licensecheck'
+perl -MCPAN -e "CPAN::Shell->notest('install', 'App::Licensecheck')"