build: Allow for kata project build

Rework the build system to allow the runtime to be built for either
of the following:

- Clear Containers (`cc-runtime` binary and configuration)
- Kata Containers (`kata-runtime` binary and configuration)

The existing build rules are retained but there are now two new rules:

```
$ make build-kata-system
$ sudo make install-kata-system
```

Two new variables have also been added:

- `KATA_SYSTEM_BUILD`: set to any value to build/install for Kata.
- `SYSTEM_BUILD_TYPE`: build for either Clear Containers (set to `cc`) or
  Kata (set to `kata`).

See `make help` for further details.

Note that configuration files are installed to a project-specific
directory, allowing for systems to be installed for both Kata and Clear
Containers.

Finally, the bash completion and collection scripts have been updated
to work for either project.

Fixes #919, #921.

Signed-off-by: James O. D. Hunt <[email protected]>

.gitignore

@@ -1,5 +1,9 @@
 /cc-runtime
+/kata-runtime
 /coverage.html
 /config-generated.go
 /data/cc-collect-data.sh
+/data/cc-collect-data.sh.in
+/data/completions/bash/cc-runtime
+/data/completions/bash/cc-runtime.in
 /config/configuration.toml