Bug#816406: mdadm mkconf doesn't parse mdadm.conf correctly(whitespace)

[Adam Heath]

Package: mdadm
Severity: minor
Version: 3.3.2-5+deb8u1

/usr/share/mdadm/mkconf attemps to read DEVICE out of 
/etc/mdadm/mdadm.conf, using sed.  It does this, with a simple regex, 
"s/^DEVICE //p". This is not valid.  mdadm.conf(5) says you can have any 
whitespace after it(space, tab, even newline).  The first sentence of 
the SYNTAX section, says it's a series of words separated by whitespace.