xen/scripts: add xen-analysis.py for coverity and eclair analysis

Add new script for coverity/eclair analysis tool that will enable
the procedure to suppress findings when these tool are used.
The procedure is documented in docs/misra/documenting-violations.rst
and the script is documented in docs/misra/xen-static-analysis.rst.

Add in docs/misra/ the files safe.json and
false-positive-{coverity,eclair}.json that are JSON files containing
the data structures for the justifications, they are used by the
analysis script to link the Xen tags to the proprietary tool comment.

Add docs/misra/documenting-violations.rst to explain how to add
justifications.

Add docs/misra/xen-static-analysis.rst to explain how to use the
script to analyse Xen.

Add analysis artifacts files to .gitignore.

Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Tested-by: Stefano Stabellini <sstabellini@kernel.org>

.gitignore

@@ -10,6 +10,7 @@
 *.c.cppcheck
 *.opic
 *.a
+*.safparse
 *.so
 *.so.[0-9]*
 *.bin