References to stable/folsom branches replaced by tag folsom-eol

Once Folsom was declared EOL all corresponding branches were removed
from project repos. The config is changed to retrieve commits from
master until tag 'folsom-eol'

Fixes bug 1281584

Change-Id: I420dbea87d33520957214eb05a0853ecae76468a
Merge "References to stable/folsom branches replaced by tag folsom-eol"