libnss-mdns: fix mDNS resolving speed

libnss-mdns: fix mDNS resolving speed

We need to fix the "hosts: files dns mdns4" nsswitch.conf line
because for a .local lookup it does a DNS lookup first which will fail.
The recommended solution is:
hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4

[YOCTO #2502]

(From OE-Core rev: dbb350b90417962f2da4c1064ab0174badeb0f26)

Signed-off-by: Constantin Musca <constantinx.musca@intel.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>