vmimage.subr: Include dangling symlinks in imagesHEADmain

When creating VM images, we filter the METALOG file created by pkg(8)
when installing non-base packages, rejecting any lines which correspond
to files which don't exist; this solves a problem which arose when a
package was installed and then deinstalled (or upgraded) later in the
image-building process.

Unfortunately [ -e ... ] follows symlinks and is not basedir-aware, so
an absolute symlink which is valid *inside* the image is omitted from
the image if it points to something which isn't present in the build
host system.

Replace [ -e ... ] with [ -e ... ] || [ -L ... ] so that symlinks are
included even if dangling.

While I'm here, add quoting in case future paths become problematic.

Sponsored by:	Amazon
MFC after:	3 days

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