LPS-42670 make '-shared' suffix optional

when omitting '-shared' from your lib, use

    <var name="plugin.packaging" value="jar" />

in your build.xml to set the proper packaging extension
Revert "LPS-42670 make '-shared' suffix optional"

This reverts commit d65690b2849c64b66197f53e72b70eac043d0973.
LPS-42670 This should ber less disruptive, and achieves the same thing without requiring each plugin to specify that it's a "jar" ?