.gitlab/issue_templates: Add bug template

Template has been taken from old gitlab instance.

Signed-off-by: Pavel Zhukov <pavel.zhukov@huawei.com>
(cherry picked from commit d79daf1c)

.gitlab/issue_templates/Bug.md

+## The module affected
+
+## What is the action to reproduce the bug?
+
+(Steps to reproduce)
+
+## What is the result you see?
+
+(Actual result)
+
+## What is the result you expect?
+
+(Expected behaviour)
+
+## Frequency?
+
+(always, sometimes, one-time issue)
+
+## Tested version
+
+(image name and version, platform)
+
+## Do you know any workaround of this issue?
+
+(link to workaround/mitigation steps etc)
+
+## Do you have a fix for this issue?
+
+(link to upstream patch, merge/pull request)
+
+/label ~bug ~needs-investigation