views: use \s to match whitespace in client import regex

Some programs substitute regular space characters (\u0020) by en spaces
(\u2002) when displaying monospace text. Others replace it by
non-breaking spaces.

Using a character set such as [ \t\n] to match any possible "space
related" character. Use \s to match any kind of whitespace related
character in the regex.

Pasted from python's documentation:

\s

    For Unicode (str) patterns:

	Matches Unicode whitespace characters (which includes
	[ \t\n\r\f\v], and also many other characters, for example the
	non-breaking spaces mandated by typography rules in many languages). If
	the ASCII flag is used, only [ \t\n\r\f\v] is matched.
	[...]

Fixes: d9f8c95618
('views: better dhcp conf parsing when importing clients')

ogcp/views.py

@@ -937,15 +937,15 @@ def action_clients_import_get():
                            scopes=scopes)
 
 
-OG_REGEX_DHCPD_CONF = (r'(?: *host *)'
+OG_REGEX_DHCPD_CONF = (r'(?:\s*host\s*)'
                        r'([\w.-]*)'
-                       r'(?:[ \n\r]*{[ \n\r]*)'
-                       r'(?:[ \t]*hardware *ethernet *)'
+                       r'(?:\s*{[ \n\r]*)'
+                       r'(?:\s*hardware *ethernet *)'
                        r'((?:[0-9A-Fa-f]{2}[:-]){5}(?:[0-9A-Fa-f]{2}))'
-                       r'(?: *;)'
-                       r'(?:[ \t\n\r]*fixed-address *)'
+                       r'(?:\s*;)'
+                       r'(?:\s*fixed-address *)'
                        r'(\d+\.\d+\.\d+\.\d+)'
-                       r'(?: *;)(?:[ \r\n]*[^}]*})')
+                       r'(?:\s*;)(?:\s*[^}]*})')
 OG_CLIENT_DEFAULT_BOOT = "pxe"
 OG_CLIENT_DEFAULT_LIVEDIR = "ogLive"
 OG_CLIENT_DEFAULT_MAINTENANCE = False