redmine: Make changeset keywords work with OS# annotation

In Osmocom we annotate osmocom issues as OS#1234 and not just as #1234,
in order to distinguish them from redmine or coverity issues.

Change-Id: I04a97434433a022f47a759a8219458e8772ae71e
Related: OS#5005, OS#3291

redmine/Dockerfile

@@ -11,3 +11,6 @@ RUN	apt-get update && \
 # no longer needed after ruby-openid-2.9.2 is used
 #ADD	hmac.diff /tmp/hmac.diff
 #RUN	cd / && patch -p0 < /tmp/hmac.diff
+
+ADD	commitlog-references-oshash.diff /tmp/commitlog-references-oshash.diff
+RUN	cd /usr/src/redmine && patch -p1 < /tmp/commitlog-references-oshash.diff

redmine/commitlog-references-oshash.diff

@@ -0,0 +1,18 @@
+diff --git a/app/models/changeset.rb b/app/models/changeset.rb
+index 4256f0589..b5ef7b298 100644
+--- a/app/models/changeset.rb
++++ b/app/models/changeset.rb
+@@ -126,11 +126,11 @@ class Changeset < ActiveRecord::Base
+ 
+     referenced_issues = []
+ 
+-    comments.scan(/([\s\(\[,-]|^)((#{kw_regexp})[\s:]+)?(#\d+(\s+@#{TIMELOG_RE})?([\s,;&]+#\d+(\s+@#{TIMELOG_RE})?)*)(?=[[:punct:]]|\s|<|$)/i) do |match|
++    comments.scan(/([\s\(\[,-]|^)((#{kw_regexp})[\s:]+)?(OS#\d+(\s+@#{TIMELOG_RE})?([\s,;&]+#\d+(\s+@#{TIMELOG_RE})?)*)(?=[[:punct:]]|\s|<|$)/i) do |match|
+       action, refs = match[2].to_s.downcase, match[3]
+       next unless action.present? || ref_keywords_any
+ 
+-      refs.scan(/#(\d+)(\s+@#{TIMELOG_RE})?/).each do |m|
++      refs.scan(/OS#(\d+)(\s+@#{TIMELOG_RE})?/).each do |m|
+         issue, hours = find_referenced_issue_by_id(m[0].to_i), m[2]
+         if issue && !issue_linked_to_same_commit?(issue)
+           referenced_issues << issue