Initialize with unreachable server

[rcmachado]

When we specify an invalid server to connect, mongotor raises the following exception when initializing:

Traceback (most recent call last):¬
  2 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102034]   File "/data/sites/euatleta_api/virtualenv/bin/torneira", line 8, in <module>¬
  3 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102096]     load_entry_point('torneira==0.3.2', 'console_scripts', 'torneira')()¬
  4 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102131]   File "/data/sites/euatleta_api/virtualenv/lib/python2.7/site-packages/torneira/runner/__init__.py", line 23, in run¬
  5 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102163]     main.start()¬
  6 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102182]   File "/data/sites/euatleta_api/virtualenv/lib/python2.7/site-packages/torneira/runner/main.py", line 28, in start¬
  7 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102210]     exec("import %s as settings" % os.path.splitext(os.path.basename(options.settings_file))[0])¬
  8 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102230]   File "<string>", line 1, in <module>¬
  9 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102338]   File "/data/sites/euatleta_api/euatleta_api/api/settings.py", line 2, in <module>¬
 10 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102363]     from api.settings_base import *¬
 11 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102383]   File "/data/sites/euatleta_api/euatleta_api/api/../api/settings_base.py", line 2, in <module>¬
 12 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102408]     from core.settings import *¬
 13 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102427]   File "/data/sites/euatleta_api/virtualenv/lib/python2.7/site-packages/core/settings.py", line 36, in <module>¬
 14 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102456]     maxusage=300)¬
 15 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102475]   File "/data/sites/euatleta_api/virtualenv/lib/python2.7/site-packages/mongotor/database.py", line 133, in connect¬
 16 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102519]     database.init(addresses, dbname, read_preference, **kwargs)¬
 17 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102539]   File "/data/sites/euatleta_api/virtualenv/lib/python2.7/site-packages/mongotor/database.py", line 59, in init¬
 18 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102573]     node = Node(host, port, self, self._pool_kwargs)¬
 19 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102593]   File "/data/sites/euatleta_api/virtualenv/lib/python2.7/site-packages/mongotor/node.py", line 51, in __init__¬
 20 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102626]     **self.pool_kargs)¬
 21 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102646]   File "/data/sites/euatleta_api/virtualenv/lib/python2.7/site-packages/mongotor/pool.py", line 58, in __init__¬
 22 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102678]     conn = self._create_connection()¬
 23 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102697]   File "/data/sites/euatleta_api/virtualenv/lib/python2.7/site-packages/mongotor/pool.py", line 68, in _create_connection¬
 24 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102728]     autoreconnect=self._autoreconnect)¬
 25 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102747]   File "/data/sites/euatleta_api/virtualenv/lib/python2.7/site-packages/mongotor/connection.py", line 41, in __init__¬
 26 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102777]     self._connect()¬
 27 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102795]   File "/data/sites/euatleta_api/virtualenv/lib/python2.7/site-packages/mongotor/connection.py", line 57, in _connect¬
 28 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102824]     raise InterfaceError(error)¬
 29 Jan 17 16:09:32 ip-10-252-106-45 kernel: [10385360.102852] mongotor.errors.InterfaceError: [Errno 99] Cannot assign requested address¬