Squashed 'external/trappy/' changes from cc2c57953..f7a3ecbbf

f7a3ecbbf Merge pull request #302 from valschneider/ftrace_function
2ea55a58e ftrace: Add support to parse function tracing ('function' tracer)
412924f28 Merge pull request #301 from JaviMerino/fix_documentation
e231aca72 Merge pull request #300 from douglas-raillard-arm/fix_custom_scope
b25800328 doc: Update Dynamic traces
5babb40b6 ftrace: Add endtime attribute
23a35ecae ftrace: Avoid storing trace-cmd report output in memory
9d67e5555 tests: Fix unit tests
08c7da476 ftrace: Only add dynamic classes on non-custom scopes

git-subtree-dir: external/trappy
git-subtree-split: f7a3ecbbfb4a92031431dca31c48eb67ac9db08d