[REFACTOR] Little clean-up in ProjectNegotiation classes

Pulled up a method, sorted class members, renamed static members.

Change-Id: Icf26afebb416b1d7ebca375232d35aa9a9627286
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1544
Tested-by: Jenkins CI
Reviewed-by: Damla Durmaz <ddurmaz88@gmail.com>
Reviewed-by: Arsenij Solovjev <xeper000@gmail.com>
Reviewed-by: Martin Wichner <martin.wichner@googlemail.com>
Reviewed-by: Arndt Lasarzik <alasarzik@gmail.com>
Reviewed-by: Franz Zieris <zieris@inf.fu-berlin.de>