* [sonic build] Define folder macro for target folder /usr/sonic/share/templates
* [sonic-cfggen] allow templates to include from common folders
- Allow templates to include files under /usr/share/sonic/templates
- Allow templates to include files in the same folder as the root template
* [Buffer config] install the buffer configuration template
* [Arista7260cx3] Add buffer configuration for Arista7260CX3 T0 topology
- pg profile look up table is incomplete. Currently contains T0 default
values.
* [Arista7260cx3] Adding QoS configuration
* Address review comments
1. Stop generating ingress pg configuration for lossless pgs.
2. Stop putting ports into speed sets, put all ports in one set.
3. Remove ingress lossless profiles.
4. Added some tailing '-' back to remove leading spaces.
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