Admin menu: Fix FieldError in searches
In admin view whenever we search for bugcomment will raise FieldError.
This patch will update the ForiegnKey relation according to the model on search_fields for below Models:
- BugCommentModel
- BugTrackerAccountModel
This fixes: #105 (closed)
Signed-off-by: Patnana, Venkata Sai venkata.sai.patnana@intel.com