Add template_is_optional flag to modules

[mrichardson03]

Is your feature request related to a problem?

The flag template_is_optional has been added to the helper module to support resources that can be created directly on Panorama as well as in a template/template stack. This needs to be added to additional modules.

Describe the solution you'd like

Add template_is_optional=True to the following modules:

• panos_email_profile
• panos_email_server
• panos_http_profile
• panos_http_profile_header
• panos_http_profile_param
• panos_http_server
• panos_snmp_profile
• panos_snmp_v2c_server
• panos_snmp_v3_server
• panos_syslog_profile
• panos_syslog_server

[mrichardson03]

This is going to require changes in pan-os-python.

[Eric-Jckson]

This would be a valuable option for automating base panorama configuration settings.