utils: update lint settings

Unlike the other crates, holo-utils can't inherit the linter settings
from the workspace. This is because holo-utils needs to call the
unsafe `libc::setsockopt` function, whereas the workspace settings
forbid unsafe code altogether.

Currently, it isn't possible to selectively override inherited
lint settings from the workspace. Consequently, this commit syncs
holo-utils with the workspace lint settings, with the exception of
permitting unsafe code.

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>

holo-utils/Cargo.toml

@@ -35,6 +35,10 @@ holo-yang = { path = "../holo-yang" }
 [lints.rust]
 rust_2018_idioms = "warn"
 
+[lints.clippy]
+too_many_arguments = "allow"
+manual_range_contains = "allow"
+
 [features]
 default = []
 testing = []