urllib3 throws lots of warnings caused by SSLErrors using requests

I have started using the logging library to catch potential performance issues, and my logs are flooded with urlllib3 warnings using requests, like those:

WARNING:urllib3.connectionpool:Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLError("bad handsha
ke: SysCallError(-1, 'Unexpected EOF')",),)': /store/search?q=in+one+editor&c=apps&hl=en

This doesn't break the code or exit the program, but floods my logs with warnings and potentially affects performance. The warning appears when sending requests to https:/.play.google.com/store/search?q=query&c=apps&hl=en. I'm not too good with SSL and the like, so I'm unsure of what's happening.

After reading about similar issues on this git, I have tried using the adapter below, which uses extra ciphers:

## Reproduction Steps

```# -*- coding: utf-8 -*-
"""
requests_toolbelt.source_adapter
================================

This file contains an implementation of the SourceAddressAdapter originally
demonstrated on the Requests GitHub page.
"""
from requests.adapters import HTTPAdapter

from .._compat import poolmanager, basestring

import ssl
from requests.packages.urllib3.util.ssl_ import create_urllib3_context

# This is the 2.11 Requests cipher string, containing 3DES.
CIPHERS = (
    'ECDH+AESGCM:DH+AESGCM:ECDH+AES256:DH+AES256:ECDH+AES128:DH+AES:ECDH+HIGH:'
    'DH+HIGH:ECDH+3DES:DH+3DES:RSA+AESGCM:RSA+AES:RSA+HIGH:RSA+3DES:!aNULL:'
    '!eNULL:!MD5'
)

class SourceAddressAdapter(HTTPAdapter):
    """
    A Source Address Adapter for Python Requests that enables you to choose the
    local address to bind to. This allows you to send your HTTP requests from a
    specific interface and IP address.

    Two address formats are accepted. The first is a string: this will set the
    local IP address to the address given in the string, and will also choose a
    semi-random high port for the local port number.

    The second is a two-tuple of the form (ip address, port): for example,
    ``('10.10.10.10', 8999)``. This will set the local IP address to the first
    element, and the local port to the second element. If ``0`` is used as the
    port number, a semi-random high port will be selected.

    .. warning:: Setting an explicit local port can have negative interactions
                 with connection-pooling in Requests: in particular, it risks
                 the possibility of getting "Address in use" errors. The
                 string-only argument is generally preferred to the tuple-form.

    Example usage:

    .. code-block:: python

        import requests
        from requests_toolbelt.adapters.source import SourceAddressAdapter

        s = requests.Session()
        s.mount('http://', SourceAddressAdapter('10.10.10.10'))
        s.mount('https://', SourceAddressAdapter(('10.10.10.10', 8999))
    """
    def __init__(self, source_address, **kwargs):
        if isinstance(source_address, basestring):
            self.source_address = (source_address, 0)
        elif isinstance(source_address, tuple):
            self.source_address = source_address
        else:
            raise TypeError(
                "source_address must be IP address string or (ip, port) tuple"
            )

        super(SourceAddressAdapter, self).__init__(**kwargs)

    def init_poolmanager(self, connections, maxsize, block=False, **kwargs):
        context = create_urllib3_context(ciphers=CIPHERS)
        kwargs['ssl_context'] = context
        self.poolmanager = poolmanager.PoolManager(
            num_pools=connections,
            maxsize=maxsize,
            block=block,
            source_address=self.source_address,
            **kwargs)

    def proxy_manager_for(self, *args, **kwargs):
        context = create_urllib3_context(ciphers=CIPHERS)
        kwargs['ssl_context'] = context
        kwargs['source_address'] = self.source_address
        return super(SourceAddressAdapter, self).proxy_manager_for(
            *args, **kwargs)
```

## System Information

    $ python -m requests.help

```
{
  "chardet": {
    "version": "3.0.4"
  },
  "cryptography": {
    "version": "2.2.1"
  },
  "idna": {
    "version": "2.6"
  },
  "implementation": {
    "name": "CPython",
    "version": "3.5.2"
  },
  "platform": {
    "release": "4.4.0-112-generic",
    "system": "Linux"
  },
  "pyOpenSSL": {
    "openssl_version": "1010007f",
    "version": "17.5.0"
  },
  "requests": {
    "version": "2.18.4"
  },
  "system_ssl": {
    "version": "1000207f"
  },
  "urllib3": {
    "version": "1.22"
  },
  "using_pyopenssl": true
}
```

This command is only available on Requests v2.16.4 and greater. Otherwise,
please provide some basic information about your system (Python version,
operating system, &c).

Hi there! Thanks for opening this issue. Unfortunately, it seems this is a request for help instead of a report of a defect in the project. Please use [StackOverflow](https://stackoverflow.com) for general usage questions instead and only report defects here.