Ensure that g_vasprintf will always abort on OOM and some docs fixes

Daniel P. Berrangerequested to merge
dberrange/glib:str-printf-abort-oom into master

This fixes a couple of the issues raised in #1622 (closed) which I discovered & was fixing independently when I came across that ticket.

These patches ensure that g_vasprintf will always abort on OOM, and add annotations to various parameters, and document that the returned string is guaranteed non-NULL unless using locale sensitive conversions.

Edited by Daniel P. Berrange

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