Pkg delete now returns valid exit code.
Pkg delete now returns valid exit code.

When started in dry-run mode (-n flag) pkg-delete always returned
EX_SOFTWARE even if it actually succeeded. This patch fixes this
issue.

en90/pkg,junovitch/pkg,Open343/pkg,Open343/pkg,khorben/pkg,khorben/pkg,junovitch/pkg,khorben/pkg,skoef/pkg,en90/pkg,skoef/pkg