Added time section for EIB, metal3 and elemental

[e-minguez]

We've been receiving some complains (especially on the elemental workflow) about things not working that turned out to be clock issues. Adding explicit docs will probably avoid similar issues in the future.

[rdoxenham]

Looks good @e-minguez - the one thing I'd recommend is that rather than using a pool.server.com example, perhaps we just use the default SUSE pool? 2.suse.pool.ntp.org as an example? That way, if people blindly copy configuration files, it should still largely work :)

[e-minguez]

Looks good @e-minguez - the one thing I'd recommend is that rather than using a pool.server.com example, perhaps we just use the default SUSE pool? 2.suse.pool.ntp.org as an example? That way, if people blindly copy configuration files, it should still largely work :)

Good suggestion! Changed, PTAL :)

[rdoxenham]

LGTM. We could add a note about the fact that these are just examples, but I think I'm overthinking it.

[e-minguez]

LGTM. We could add a note about the fact that these are just examples, but I think I'm overthinking it.

But you are right and it won't hurt. Changed. PTAL.

[alknopfler]

just a comment but LGTM

[e-minguez]

Final check after committing @atanasdinov and @alknopfler suggestions (thanks)