Fix support of IDNA in Client

[Martiusweb]

What do these changes do?

Use the IDNA-encoded version of the host in:

• the Host header of a request,
• the path of a CONNECT request (this one is untested),
• CookieJar.update_cookies() and CookieJar.filter_cookies()

Are there changes in behavior for the user?

Users will be able to use unicode hostnames when performing a request, using a proxy or using CookieJar update_cookies() and filter_cookies() methods.

Related issue number

Fixes #1444 and some other places where raw_host should be used.

[codecov-io]

Current coverage is 98.81% (diff: 100%)

Merging #1445 into master will not change coverage

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  Hits           6849       6849          
  Misses           40         40          
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[asvetlov]

Thanks!

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