internet package should try also other urls than bootstrap.grid.tf

[xmonader]

because it might be down and we won't be sure if we got actual internet and can reach bootstrap.grid.tf or if we have it and the bootstrap website is down

[muhamadazmy]

we actually then need to test the hub.grid.tf because if that one is down we won't be able to continue the boot anyway

[muhamadazmy]

@Eslam-Nawara this is a very easy task. we have an internet binary (under cmds/internet) that tries to test connectivity to some public services. We need to make sure we also include the hub.grid.tf