CLOUDSTACK-7620: Added SNMP MIB file for snmp-alerts plugin
CLOUDSTACK-7913 : Added reconnect functionality to Host class in base.py

Signed-off-by: SrikanteswaraRao Talluri <talluri@apache.org>
CLOUDSTACK-7912: Remove hardcoded netscaler info and read it from config file

Signed-off-by: SrikanteswaraRao Talluri <talluri@apache.org>