Dictionary update for Juniper EX3200 and EX4200 series switches.

Added some missing Juniper EX3200 and EX4200 series switches to dictionary.
Removed space in model entiy from existing EX series switches IAW Juniper's naming standard as described here:

http://www.juniper.net/techpubs/en_US/release-independent/junos/topics/reference/general/ex3200-model-numbers.html
http://www.juniper.net/techpubs/en_US/release-independent/junos/topics/reference/general/ex4200-model-numbers.html