typo fixes all over the place

found and semi-manually replaced by using:
 codespell -L mut -L crate -i 3 -w

Mostly in comments, but also email notification and two occurrences
of misspelled  'reserved' struct member, which where not used and
cargo build did not complain about the change, soo ...

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

src/config/network/helper.rs

@@ -82,7 +82,7 @@ pub fn check_netmask(mask: u8, is_v6: bool) -> Result<(), Error> {
     Ok(())
 }
 
-// parse ip address with otional cidr mask
+// parse ip address with optional cidr mask
 pub fn parse_address_or_cidr(cidr: &str) -> Result<(String, Option<u8>, bool), Error> {
 
     lazy_static! {