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Remove obsolete 'who' arguement, which was used as an owner for the
corresponding xlock structure. Since xlocks now creates its own owner, theres is
no need for providing an 'owner' arguement on xq API.

Use the tuple (PID, TID, PC) as lock owner of the xseg locks.
Remove the provided owner argument and use the above triplet value as the lock
owner.

Change all xlock_acquire occurrences where a dummy owner value was used, to the
new XLOCK_UNKNOWN_OWNER value.

According to the decision of the GRNET Board of Directors,
switch license to GPLv3.

This commit will be propagated to the release
and master branches based on git flow, and the next
release will be licensed as GPLv3.

Introduce a new flag (XCACHE_USE_RMTABLE) that will be set only by the
peers that want to use the rm_table. The rest of the peers don't need to
set anything. This should boost speed for the latter peers, since they
won't unnecessarily try to acquire the rm_lock on inserts and puts

Changes:

* The "post_evict" hook is no longer necessary and is superseded by this
  flag.
* This flag is passed during xcache_init in the "flags" parameter.

Refactor xcache_entry_put to bypass the ABA problem with the refcount of
cache entries. The proposed solution is not the most optimal, but will
suffice until a better one is implemented.

Also, add more assertions in various places in the code to ease the
debugging process.