Correct name of source archive if reference contains '/'

If we have reference like stable/kilo name of source archive
will contain only last part of reference. We should replace '/'
with '-' to have full name. This is useful for correct
identification of source code afterwards.

Change-Id: I1ff1015e3f7926110d0fcb59504e58a5e80a75f9
Closes-Bug: #1492279