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bsdinstall/zfsboot: Skip adding swap lines to /etc/fstab if swap is 0 sized

Description

bsdinstall/zfsboot: Skip adding swap lines to /etc/fstab if swap is 0 sized

Differential Revision: https://reviews.freebsd.org/D2571
Reviewed by: dim
Approved by: eadler (mentor)
Sponsored by: ScaleEngine Inc.