Poudriere incremental queue rework

gistfile1.txt

[00:01:02] Building 417 packages using up to 14 builders
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[00:01:09] [04] [00:00:02] Inspecting net/arping | arping-2.21 for needed shlibs
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[00:01:09] [02] [00:00:00] Inspecting devel/p5-Locale-gettext | p5-Locale-gettext-1.07 for needed shlibs
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[00:01:09] [04] [00:00:00] Inspecting security/libgpg-error | libgpg-error-1.43 for needed shlibs
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[00:01:09] [01] [00:00:00] Inspecting security/rhash | rhash-1.4.2 for needed shlibs
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[00:01:10] [02] [00:00:00] Inspecting lang/lua52 | lua52-5.2.4 for needed shlibs
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[00:01:10] [08] [00:00:01] Inspecting archivers/gtar | gtar-1.34 for needed shlibs