protocol/server: handle group id decoding in a stricter way
protocol/server: handle group id decoding in a stricter way

This causes crash between 3.0.x servers and 2.0.x clients

Signed-off-by: Anand V. Avati <avati@amp.gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 564 (3.0.1rc3 server daemon crashes when any of the 2.0.x version client connects)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=564

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster