SM Provisioning: default value for mysql max_connections too low

[Nitish Krishna Kaveri]

After upgrading the puppet modules to kilo, the mysql max_connections default which was previously 10000 has been reduced to 151.
This is causing issues for horizon, Contrail Webui to login.
Compare:
Old: https://github.com/Juniper/contrail-puppet/blob/841395d7aaed11799a79cd5193d9180f4ba3cd95/contrail/environment/modules/mysql/manifests/params.pp#L203

vs. New:
https://github.com/Juniper/contrail-puppet/blob/master/contrail/environment/modules/mysql/manifests/params.pp#L407

[Nitish Krishna Kaveri (nitishk)]

issue found in 2736 but fixed after that