(GH-607) Pack Strips Out Choco Specific Metadata
(GH-607) Pack Strips Out Choco Specific Metadata

In NuGet.Core, manifest creation has a secondary path (an overload to
`Create()` ) in 2.11 and they did not use a shared method to set the
metadata that was alike. The DRY violation has been fixed so both
`Create` methods now go through the same path to set similar metadata.

eeevans/choco,bazzilic/choco,bazzilic/choco,jberezanski/choco,Apteryx0/choco,Apteryx0/choco,dtgm/choco,TheBigBear/choco,TheBigBear/choco,jberezanski/choco,jberezanski/choco,sideeffffect/choco,eeevans/choco,dtgm/choco,sideeffffect/choco,TheBigBear/choco