Add: update lttng_ust_event struct
Update liblttng-ust-ctl to send object_name to app
Add enabler for dynamic instrumentation
Add missing fields
Rename object_name to object_path
Notify sessiond to do instrumentation
Update ustcomm_instrument_probe
Add: ustctl_recv_instrument_probe and ustctl_reply_instrument_probe
Remove unused session_objd
Fix a bug handling notify command
Move code to keep a consistent order

BUG: call to lttng_probe_instrument need to find a better place
Pass event name back to sessiond
Pass object_path back to sessiond
Change ust-abi.h to fix ABI break
Change struct layout to simplify code
Change API
Fix padding length
Add ustctl_set_target
Handle LTTNG_UST_TARGET command
Minor fixes