* origin/master:
  master,client: ignore notifications before complete initialization
  Update comment that was still showing UUIDs instead of node ids
  Remove dead code found by coverage
  Remove some useless unit tests

A backup master crashed with the following traceback after a reconnection:

    Traceback (most recent call last):
      File "neo/master/app.py", line 127, in run
        self._run()
      File "neo/master/app.py", line 147, in _run
        self.playPrimaryRole()
      File "neo/master/app.py", line 348, in playPrimaryRole
        self.backup_app.provideService())
      File "neo/master/backup_app.py", line 123, in provideService
        poll(1)
      File "neo/lib/event.py", line 126, in poll
        to_process.process()
      File "neo/lib/connection.py", line 500, in process
        self._handlers.handle(self, self._queue.pop(0))
      File "neo/lib/connection.py", line 110, in handle
        self._handle(connection, packet)
      File "neo/lib/connection.py", line 125, in _handle
        handler.packetReceived(connection, packet)
      File "neo/lib/handler.py", line 117, in packetReceived
        self.dispatch(*args)
      File "neo/lib/handler.py", line 66, in dispatch
        method(conn, *args, **kw)
      File "neo/master/handlers/backup.py", line 52, in invalidateObjects
        app.invalidatePartitions(tid, partition_set)
      File "neo/master/backup_app.py", line 257, in invalidatePartitions
        self.triggerBackup(node)
      File "neo/master/backup_app.py", line 281, in triggerBackup
        assert cell_list, offset
    AssertionError: 0

* master:
  Enable coverage for neo.tests, which is useful to find dead code
  Remove unused imports, found by pylint
  TODO: tweak should be safer
  Various neoctl/neolog formatting improvements/fixes
  debug: extend 'pdb' example to optionally break on an arbitrary list of callables
  client: fix simultaneous (re)connections to the master

Many "unit" tests (!= "threaded" tests) don't do more than checking
implementation details, and increase coverage artificially. As with testEvent
in commit 71e30fb9, most of these tests will
either be removed or rewritten as threaded tests.

The fact that the remaining unit tests actually cover code that other test
don't gives motivation to maintain them. It will be also less code to update
when switching to https://pypi.python.org/pypi/mock

I proceeded as follows:

1. Measure coverage for all tests except unit tests. While checking my work,
   I found that coverage stats for threaded/functional/zodb tests are quite
   unstable, so I restarted from the beginning by doing this measure several
   times and only keeping the intersection of coverage data.

2. Measure coverage individually for each 'unit' tests, and substract the
   each result with the data in 1.

3. The candidates for deletion are those without any code covered.

Tests I didn't delete:

- neo.tests.master.testElectionHandler: I always do minimal changes about
  election, as long as there's no serious review.

- neo.tests.master.testMasterPT.MasterPartitionTableTests.test_13_outdate

- 4 tests in neo.tests.testPT:
  test_01_Cell, test_04_removeCell, test_06_clear, test_08_filled

- neo.tests.storage.testStorage{MySQL,SQLite}

- neo.tests.testUtil.UtilTests.testReadBufferRead

In a way, this commit is actually quite conservative. There are still many
useless tests that only check error paths and for simple tested methods, this
is just duplicating thie tested code.

- format IPv6 inside [] when followed by :<port>
- unify rendering of node lists
- neoctl: do not crash on empty DB (no PT id)

This fixes a reqression in commit c39d5c67,
which could leads to failures like:

2016-11-29 09:56:58,756 ERROR ZODB.Connection Couldn't load state for 0x4843
Traceback (most recent call last):
  File "ZODB/Connection.py", line 860, in setstate
    self._setstate(obj)
  File "ZODB/Connection.py", line 901, in _setstate
    p, serial = self._storage.load(obj._p_oid, '')
  File "neo/client/Storage.py", line 82, in load
    return self.app.load(oid)[:2]
  File "neo/client/app.py", line 352, in load
    data, tid, next_tid, _ = self._loadFromStorage(oid, tid, before_tid)
  File "neo/client/app.py", line 372, in _loadFromStorage
    for node, conn in self.cp.iterateForObject(oid, readable=True):
  File "neo/client/pool.py", line 91, in iterateForObject
    pt = self.app.pt
  File "neo/client/app.py", line 146, in __getattr__
    return self.__getattribute__(attr)
AttributeError: 'Application' object has no attribute 'pt'

* master:
  storage: fix crash when a client loses connection to the master just before voting
  no change: only some code reindentation
  Enable branch coverage measurement by default
  coverage: add support for functional tests

This is similar to commit 7aecdada
and for completeness, we also protect unlock the same way.

For 2 previous commits, we didn't reindent in order to keep the diff readable.