CLOUDSTACK-3969: Upgrade failed from 3.0.3 to 4.2 in KVM host with error 4.2.0 KVM SystemVm template not found though systemvm-kvm-4.2 template is uploaded during 3.0.3 setup

This is due to mysql version conflict with '=' and 'LIKE'.
Changing to '=' while searching for new system template.
Cloudstack-2997 unable to update concurrent_conncetions feild in network_offerin.

Signed-off-by: Abhinandan Prateek <aprateek@apache.org>