pkgng/pkgng 83e9c5elibpkg pkg_audit.c pkg.h.in, src audit.c upgrade.c

Track the number of affected pkgs as well and display to the user.

Thanks to @wca for the review.

This fixes #1463.
DeltaFile
+7-1libpkg/pkg_audit.c
+4-3src/audit.c
+1-1libpkg/pkg.h.in
+1-1src/upgrade.c
+13-64 files

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