Network configuration for OpenMPI/CXI (#52)

Add `network.yaml` files to the cluster configurations, to support
building OpenMPI and low-level network libraries.

The stackinator work that uses `network.yaml` was merged:
eth-cscs/stackinator#256

Note that the definitions of libfabric, etc, are currently pinned to
commits on `main`/`master` of the source repositories, which isn't ideal
- but with this feature we can start using concrete versions when it is
possible.

Author: bcumming

balfrin/network.yaml

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+../site/network/a100/network.yaml

beverin/network.yaml

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+../site/network/amdgpu/network.yaml

bristen/network.yaml

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+../site/network/a100/network.yaml

clariden/network.yaml

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+../site/network/gh200/network.yaml

daint/network.yaml

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+../site/network/gh200/network.yaml

eiger/network.yaml

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+../site/network/zen/network.yaml

pilatus/network.yaml

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+../site/network/zen/network.yaml

santis/network.yaml

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+../site/network/gh200/network.yaml

site/network/a100/network.yaml

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+mpi:
+  cray-mpich:
+    specs: ["libfabric@1.22"]
+  openmpi:
+    specs: ["libfabric@2.2.0"]
+packages:
+  # adding a variant to the variants field of a package
+  #   e.g. packages:openmpi:variants
+  # is not strong enough: if that variant does not exist it simply will be ignored with no error message
+  openmpi:
+    buildable: true
+    require:
+      - 'schedulers=slurm'
+      - 'fabrics=cma,ofi,xpmem'
+      - '+internal-pmix'
+      - '+cray-xpmem'
+    prefer:
+      - '+cuda'
+    variants: []
+  cray-mpich:
+    buildable: true
+    prefer:
+      - '+cuda'
+      - '@8.1.32'
+  libfabric:
+    buildable: true
+    externals:
+    - spec: libfabric@1.22.0 fabrics=cxi,rxm,tcp
+      prefix: /opt/cray/libfabric/1.22.0/
+    version: ["git.v2.2.0=main"]
+    require: fabrics=cxi,rxm,tcp
+  libcxi:
+    version: ["git.be1f7149482581ad589a124e5f6764b9d20d2d45=main"]
+  cxi-driver:
+    version: ["git.08deb056fac4ca8b0d3d39b5f7cc0dad019ee266=main"]
+  cassini-headers:
+    version: ["git.59b6de6a91d9637809677c50cc48b607a91a9acb=main"]
+

site/network/amdgpu/network.yaml

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+mpi:
+  cray-mpich:
+    specs: ["libfabric@1.22"]
+  openmpi:
+    specs: ["libfabric@2.2.0"]
+packages:
+  # adding a variant to the variants field of a package
+  #   e.g. packages:openmpi:variants
+  # is not strong enough: if that variant does not exist it simply will be ignored with no error message
+  openmpi:
+    buildable: true
+    require:
+      - 'schedulers=slurm'
+      - 'fabrics=cma,ofi,xpmem'
+      - '+internal-pmix'
+      - '+cray-xpmem'
+    prefer:
+      - '+rocm'
+    variants: []
+  cray-mpich:
+    buildable: true
+    prefer:
+      - '+rocm'
+      - '@8.1.32'
+  libfabric:
+    buildable: true
+    externals:
+    - spec: libfabric@1.22.0 fabrics=cxi,rxm,tcp
+      prefix: /opt/cray/libfabric/1.22.0/
+    version: ["git.v2.2.0=main"]
+    require: fabrics=cxi,rxm,tcp
+  libcxi:
+    version: ["git.be1f7149482581ad589a124e5f6764b9d20d2d45=main"]
+  cxi-driver:
+    version: ["git.08deb056fac4ca8b0d3d39b5f7cc0dad019ee266=main"]
+  cassini-headers:
+    version: ["git.59b6de6a91d9637809677c50cc48b607a91a9acb=main"]
+