Rename tests requiring root

We have some complicated and non-obvious logic for skipping certain
tests when running cargo test from the root of the crate in CI, but then
an explicit invocation from the libbpf-rs/ sub-directory attempting to
run those skipped tests (now under sudo).
Simplify the logic and hopefully make it somewhat more obvious by
prefixing all tests that require root with `test_sudo_`.

Note: this is a workaround for what I'd call a bug in Cargo. I opened
rust-lang/cargo#12147 in the hopes that this
will be addressed eventually (though I don't know how realistic that
is). If we are still getting confusion even with this more explicit
naming, we may want to consider moving (or copying) libbpf-rs's .cargo/
directory into the workspace root.

Signed-off-by: Daniel Müller <deso@posteo.net>

.github/workflows/test.yml

@@ -57,10 +57,10 @@ jobs:
     - name: Build
       run: cargo build --profile=${{ matrix.profile }} --locked --verbose --workspace --exclude runqslower
     - name: Run tests
-      # Skip BTF & map tests which require sudo
-      run: cargo test --profile=${{ matrix.profile }} --locked --verbose --workspace --exclude runqslower -- --skip test_object --skip test_tc --skip test_map_info --include-ignored
-    - name: Run BTF tests
-      run: cd libbpf-rs && cargo test --profile=${{ matrix.profile }} --locked --verbose -- test_object test_tc
+      # Skip tests which require sudo
+      run: cargo test --profile=${{ matrix.profile }} --locked --verbose --workspace --exclude runqslower -- --skip test_sudo_  --include-ignored
+    - name: Run root tests
+      run: cd libbpf-rs && cargo test --profile=${{ matrix.profile }} --locked --verbose -- test_sudo_
 
   build-minimum:
     name: Build using minimum versions of dependencies