zenohd's directory is the last searched path for plugin loading

[fuzzypixelz]

Describe the bug

/example/path/to/zenohd searches for plugins in the following order:

1. $PWD
2. $HOME/.zenoh/lib
3. /opt/homebrew/lib
4. /usr/local/lib
5. /usr/lib
6. /example/path/to

This is because the search path Vec is ordered from first to last searched path, but (6) is inserted at the end here:

zenoh/commons/zenoh-util/src/lib_loader.rs

Lines 73 to 87 in 9e1c4a8

	fn _new(mut search_paths: Vec<PathBuf>, exe_parent_dir: bool) -> Self {
	if exe_parent_dir {
	match std::env::current_exe() {
	Ok(path) => match path.parent() {
	Some(p) => if p.is_dir() {
	search_paths.push(p.canonicalize().unwrap())
	},
	None => warn!("Can't search for plugins in executable parent directory: no parent directory for {}.", path.to_string_lossy()),
	},
	Err(e) => warn!("Can't search for plugins in executable parent directory: {}.", e),
	}
	}
	LibLoader { search_paths }
	}

To reproduce

1. touch libzenoh_plugin_rest.dylib
2. cargo run --bin zenohd

System info

• ref: 9e1c4a8680a04b34f09dd2776d07958c8aae6f92

[fuzzypixelz]

Resolved in #1278.