Bug no_proxy support

[jfouret]

Hi,

if no_proxy is written with blank spaces between comma, it will not be correctly handled.

example :
no_proxy='example1.com, example2.com'

In addition, by looking at the code I am not sure the following will be correctly handled either:
no_proxy='example1.com,*,example2.com'
OK there is no sense of doing that but it has no reason not to work !?

support of IP range (e.g 10.0.0.0/24) might be also good !

maybe the better would the to
-split the content the of no_proxy variable
-iterate over each splitted string
----remove blankspace at the beginning and the end
----check for forbbiden character (report as warning and ignore ?)
----recognize IP address and also IP address range
----append one (or many in case of IP range) to the bypass_hosts attribute of ProxyInfo class
-replace the by_pass_host method by using a unix-style regex (maybe glob library ?)