tools: Install latest npm in semaphore-prepare (#6328)
tools: Install latest npm in semaphore-prepare (#6328)

Semaphore's VMs already have that (so there this is a no-op), but Ubuntu
14.04's version is too old for Cockpit. This fixes running the semaphore
scripts in a local chroot.
cockpit-project/cockpit,deryni/cockpit,moraleslazaro/cockpit,SotolitoLabs/cockpit,deryni/cockpit,SotolitoLabs/cockpit,dperpeet/cockpit,dperpeet/cockpit,stefwalter/cockpit,cockpituous/cockpit,michalskrivanek/cockpit,harishanand95/cockpit,xhad/cockpit,mvollmer/cockpit,SotolitoLabs/cockpit,stefwalter/cockpit,SotolitoLabs/cockpit,SotolitoLabs/cockpit,xhad/cockpit,moraleslazaro/cockpit,dperpeet/cockpit,cockpituous/cockpit,xhad/cockpit,andreasn/cockpit,martinpitt/cockpit,martinpitt/cockpit,petervo/cockpit,stefwalter/cockpit,mareklibra/cockpit,stefwalter/cockpit,xhad/cockpit,petervo/cockpit,moraleslazaro/cockpit,larskarlitski/cockpit,harishanand95/cockpit,garrett/cockpit,mareklibra/cockpit,larskarlitski/cockpit,dperpeet/cockpit,mareklibra/cockpit,Scribery/cockpit,larskarlitski/cockpit,cockpit-project/cockpit,larsu/cockpit,larsu/cockpit,mvollmer/cockpit,stefwalter/cockpit,andreasn/cockpit,Scribery/cockpit,moraleslazaro/cockpit,mvollmer/cockpit,mareklibra/cockpit,garrett/cockpit,Scribery/cockpit,larsu/cockpit,andreasn/cockpit,mvollmer/cockpit,petervo/cockpit,deryni/cockpit,harishanand95/cockpit,mareklibra/cockpit,SotolitoLabs/cockpit,michalskrivanek/cockpit,larskarlitski/cockpit,petervo/cockpit,michalskrivanek/cockpit,moraleslazaro/cockpit,andreasn/cockpit,martinpitt/cockpit,garrett/cockpit,petervo/cockpit,cockpit-project/cockpit,larskarlitski/cockpit,andreasn/cockpit,harishanand95/cockpit,deryni/cockpit,deryni/cockpit,Scribery/cockpit,harishanand95/cockpit,stefwalter/cockpit,Scribery/cockpit,mareklibra/cockpit,michalskrivanek/cockpit,mareklibra/cockpit,moraleslazaro/cockpit,dperpeet/cockpit,cockpituous/cockpit,petervo/cockpit,Scribery/cockpit,andreasn/cockpit,larsu/cockpit,dperpeet/cockpit,michalskrivanek/cockpit,moraleslazaro/cockpit,cockpituous/cockpit,petervo/cockpit,xhad/cockpit,cockpit-project/cockpit,larsu/cockpit,garrett/cockpit,martinpitt/cockpit,larskarlitski/cockpit,harishanand95/cockpit,larsu/cockpit,cockpit-project/cockpit,dperpeet/cockpit,deryni/cockpit,xhad/cockpit,garrett/cockpit,michalskrivanek/cockpit,Scribery/cockpit,cockpituous/cockpit,xhad/cockpit,cockpituous/cockpit,deryni/cockpit,larskarlitski/cockpit,andreasn/cockpit,harishanand95/cockpit,martinpitt/cockpit,michalskrivanek/cockpit,SotolitoLabs/cockpit,stefwalter/cockpit,mvollmer/cockpit