CI: show the log in case of failure
CI: show the log in case of failure

Disclose the content of the 'test-suite.log' file (if available) in
case of failures inside Travis-CI. This is needed to understand what
happened and to provide hints about the proper fix (if applicable).

olafhering/libvirt,datto/libvirt,nertpinx/libvirt,datto/libvirt,crobinso/libvirt,datto/libvirt,fabianfreyer/libvirt,zippy2/libvirt,datto/libvirt,crobinso/libvirt,jardasgit/libvirt,jfehlig/libvirt,andreabolognani/libvirt,libvirt/libvirt,jfehlig/libvirt,jardasgit/libvirt,libvirt/libvirt,andreabolognani/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,jfehlig/libvirt,andreabolognani/libvirt,eskultety/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,nertpinx/libvirt,libvirt/libvirt,eskultety/libvirt,fabianfreyer/libvirt,olafhering/libvirt,crobinso/libvirt,zippy2/libvirt,fabianfreyer/libvirt,VenkatDatta/libvirt,olafhering/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,nertpinx/libvirt,zippy2/libvirt,eskultety/libvirt,zippy2/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,datto/libvirt,VenkatDatta/libvirt,libvirt/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,andreabolognani/libvirt,eskultety/libvirt,crobinso/libvirt,jfehlig/libvirt,eskultety/libvirt,olafhering/libvirt