Fix blueprint and bug parser to require a separator

Previously failed with direct URLs, e.g. https://blueprint.lau...

Have tested with python checking strings such as "bp: 4", "bp4" (fail)
and the same for "bug4" "bug:4" "bug: 4" etc.

Change-Id: I2e35286935ca648d48e4c7c18132990387d279cb
Merge "Fix blueprint and bug parser to require a separator"