virlog: Rename virLogParse* to virLogParseAndDefine*

virlog: Rename virLogParse* to virLogParseAndDefine*

Right now virLogParse* functions are doing both parsing and defining of filters
and outputs which should be two separate operations. Since the naming is
apparently a bit poor this patch renames these functions to
virLogParseAndDefine* which eventually will be replaced by virLogSet*.
Additionally, virLogParse{Filter,Output} will be later (after the split) reused,
so that these functions do exactly what the their name suggests.

Signed-off-by: Erik Skultety <eskultet@redhat.com>