Response code 201 is ok after MODE READER
Response code 201 is ok after MODE READER

cf. http://tools.ietf.org/html/rfc3977#section-5.3

Not considering 201 as Ok prevents newsreaders using libetpan to work
correctly when it happens: withou the patch they get
UNEXPECTED_RESPONSE.

Ref. bug #3390872 https://sourceforge.net/tracker/?func=detail&aid=3390872&group_id=41064&atid=429696

Signed-off-by: Sébastien Bigaret <f786053074bc148926bb17a589d5dfebfb935bfb@telecom-bretagne.eu>

jjz/libetpan,tipbit/libetpan,disaykin/libetpan,tipbit/libetpan,jjz/libetpan,jjz/libetpan,tipbit/libetpan,disaykin/libetpan,disaykin/libetpan