CLOUDSTACK-5843
For some reason the mgmt server is required to have access to the template
being registered in order to check its size against resource limits
during registration. This is bad, but worse, it's a sync call, so this
call can hang for up to the default HTTP connection timeout.

Reducing http timeout as a quick workaround, but this check needs to
1) be removed or 2) done later or 3)registerTemplate needs to be async
and 4) moved off the mgmt server (ssvm is the only thing that needs access to
template url).
Contrail plugin 4.3 fixes

Signed-off-by: Sheng Yang <sheng.yang@citrix.com>