Plugins loading ordering: all jars first

Load all the .jar plugins first, to allow the registration
of the extra ServerPluginProviders.

This make possible to have jar plugins that add support
for the loading of other type of plugin packaging, including
scripting (Groovy, Scala), directories or any other type
of future plugin format supported.

Change-Id: I2a50235b63556e3d206dd367cb3825bdd6be4db6
1 file changed