port_buf has similar purpose but uses mempool instead of realloc()

- fix a coding bug/regression in fiber.cc with wrong
  check of result of the dynamic cast
- style fixes
- fix initialization of type objects
  when some members of inheritance hierarchy were
  excluded from type hierarchy

Conflicts:
	src/box/recovery.cc
	src/box/xrow.cc

Iproto + wal permission test case
Wal writer bug fix port from 1.6.6

remove unused config

gh-613 replication conflict test cases

gh-613 after review fixes

microsleep for CRDT test case, test-run updated

CRDT fix

Conflicts:
	src/ffisyms.cc

*)added strnptr (str+len=>ptr) mhash instaniation into assoc lib

If region_join() allocated memory for key, it could be overwritten
by subsequent encoding of tuple_data().

Advance stream position before encoding the tuple.

Update result file

Don't malloc(), this code should never be used for unbounded
sizes.

Conflicts:
	src/box/lua/error.cc

Conflicts:
	src/lua/session.cc
	src/session.cc

- add a test case for authentication trigger
- pass user name to the trigger
- invoke trigger before the current user has been changed
- after review fixes

Conflicts:
	doc/sphinx/book/box/box_introspection.rst