rust: Use AsRef<Path> and PathBuf in libraries

Use `AsRef<Path>` instead of `&Path`, &str, .... to be more versatile
and accept more input types. In addition, use `PathBuf` and `Path` for
paths instead of `String` and `str`.

Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>

rust/pv/src/verify.rs

@@ -173,12 +173,17 @@ impl CertVerifier {
     /// # Errors
     ///
     /// This function will return an error if the chain of trust could not be established.
-    pub fn new(
-        cert_paths: &[&Path],
-        crl_paths: &[&Path],
-        root_ca_path: Option<&Path>,
+    pub fn new<P, Q, R>(
+        cert_paths: &[P],
+        crl_paths: &[Q],
+        root_ca_path: Option<R>,
         offline: bool,
-    ) -> Result<Self> {
+    ) -> Result<Self>
+    where
+        P: AsRef<Path>,
+        Q: AsRef<Path>,
+        R: AsRef<Path>,
+    {
         let mut store = helper::store_setup(root_ca_path, crl_paths, cert_paths)?;
         let mut untr_certs = Vec::with_capacity(cert_paths.len());
         for path in cert_paths {