metadata flag

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
HT add_str (not unique)

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>
Match ctf_traces

Introduce a new per-connection HT indexed by path_name and accepting not
unique keys.
When a new metadata stream arrives, we match all the streams with the
same path with a unique ctf_trace ID and a pointer to the metadata
stream for this ctf_trace.

Signed-off-by: Julien Desfossez <jdesfossez@efficios.com>