tests: streamline module names to unit_tests

This better aligns with the rest of the code and makes it clearer
that these tests can run "as is" in a normal hosted environments
without the special test environment.

Signed-off-by: Philipp Schuster <philipp.schuster@cyberus-technology.de>
On-behalf-of: SAP philipp.schuster@sap.com

net_util/src/lib.rs

@@ -189,7 +189,7 @@ pub fn virtio_features_to_tap_offload(features: u64) -> c_uint {
 }
 
 #[cfg(test)]
-mod tests {
+mod unit_tests {
     use super::*;
 
     #[test]

net_util/src/mac.rs

@@ -139,7 +139,7 @@ impl FromStr for MacAddr {
 }
 
 #[cfg(test)]
-mod tests {
+mod unit_tests {
     use super::*;
 
     #[test]

net_util/src/tap.rs

@@ -550,7 +550,7 @@ impl AsRawFd for Tap {
 
 #[cfg(test)]
 #[cfg(devcli_testenv)] // we need special permissions in the ENV to create Tap devices
-mod tests {
+mod unit_tests {
     use std::net::Ipv4Addr;
     use std::sync::{LazyLock, Mutex, mpsc};
     use std::time::Duration;