Name check filter

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Name Check is a filter that disallows any paths that contain defined forbidden characters or that exceed a defined length.

Table 10.73. Description of configuration options for `[filter-name_check]` in `proxy-server.conf`
Configuration option = Default value	Description
`forbidden_chars` = '"`<>	Characters that are not allowed in a name
`forbidden_regexp` = `/\./\|/\.\./\|/\.$\|/\.\.$`	Substrings to forbid, using regular expression syntax
`maximum_length` = `255`	Maximum length of a name
`use` = `egg:swift#name_check`	Entry point of paste.deploy in the server