pkgng/pkgng 0953fb0libpkg pkg_audit.c, src audit.c upgrade.c

audit: Drop privileges after opening the files/database but before parsing.

Also assert (return EPKG_FATAL) in pkg_audit_process() if running as
root.

This allows setting /var/db/pkg mode 0750.
DeltaFile
+3-0libpkg/pkg_audit.c
+2-1src/audit.c
+2-1src/upgrade.c
+7-23 files

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