examples/server_node_efd: simplify build configuration

The server_node_efd example contains various binaries whose sources are
in sub directories that do not match their name.

Rename sub directorie

examples/server_node_efd: simplify build configuration

The server_node_efd example contains various binaries whose sources are
in sub directories that do not match their name.

Rename sub directories in this example and stop overriding the binaries
names in meson.build.
This makes a next change easier in the build scripts used by CI.

Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>

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