patch/insane: Rework patch fuzz handling

patch/insane: Rework patch fuzz handling

Currently there are three issues which can be enhanced:

1. Fuzz warnings cannot be configured as errors for hardening. It happened
   often to me that these warnings were overseen and detected after commits
   were already out.
2. The output is too verbose - particularly when more than one file is
   affected. Meanwhile all users should know why patch fuzz check is performed.
   So move links with background information to insane.bbclass.
3. Reduce copy & paste effort slightly by printing PN (nit: <recipe> was not
   a correct suggestion e.g for native extended recipe - see example below)

To achieve patch.py drops patch-fuzz info encapsulated by a header- and footer-
string into log.do_patch. With this insane.bbclass can drop warnings/errors
depending on 'patch-fuzz' in ERROR_QA or WARN_QA. Default remains unchanged:
Spit out warnings only.

A message for two fuzzed patches and 'pact-fuzz' in ERROR_QA now looks like:

| ERROR: autoconf-native-2.69-r11 do_patch: Fuzz detected:
|
| Applying patch autoreconf-exclude.patch
| patching file bin/autoreconf.in
| Hunk #1 succeeded at 73 with fuzz 1 (offset -3 lines).
| Hunk #2 succeeded at 143 (offset 6 lines).
| Hunk #3 succeeded at 167 (offset 6 lines).
| Hunk #4 succeeded at 177 (offset 6 lines).
| Hunk #5 succeeded at 281 (offset 15 lines).
| Hunk #6 succeeded at 399 (offset 15 lines).
| Hunk #7 succeeded at 571 (offset 20 lines).
| Hunk #8 succeeded at 612 (offset 20 lines).
| Hunk #9 succeeded at 636 (offset 20 lines).
| Hunk #10 succeeded at 656 (offset 20 lines).
| Hunk #11 succeeded at 683 (offset 20 lines).
|
| Applying patch autoreconf-gnuconfigize.patch
| patching file bin/autoreconf.in
| Hunk #1 succeeded at 55 with fuzz 1 (offset -3 lines).
| Hunk #3 succeeded at 663 (offset 18 lines).
|
| The context lines in the patches can be updated with devtool:
|
|     devtool modify autoconf-native
|     devtool finish --force-patch-refresh autoconf-native <layer_path>
|
| Don't forget to review changes done by devtool!
|
| ERROR: autoconf-native-2.69-r11 do_patch: QA Issue: Patch log indicates that patches do not apply cleanly. [patch-fuzz]

Signed-off-by: Andreas Müller <schnitzeltony@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>