UnicodeDecodeError exception when working with SOCKS5 proxy

Multiple exceptions are thrown when nbxmpp handles SOCKS5 proxy reply with a domain name. See RFC.

Example reply which causes exceptions:

0000   05 00 00 03 3c 77 63 34 64 73 67 7a 79 6d 62 73  ....<wc4dsgzymbs
0010   69 78 76 33 73 70 67 6d 61 6b 71 63 72 68 68 79  ixv3spgmakqcrhhy
0020   63 77 65 33 33 74 70 77 6e 64 66 67 73 71 66 65  cwe33tpwndfgsqfe
0030   71 74 67 34 73 69 65 79 71 2e 62 33 32 2e 69 32  qtg4sieyq.b32.i2
0040   70 de 60                                         p.`

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