Fixed findings

List of Findings

Error: CLIPPY_WARNING: [#def1]
netavark-1.12.2-build/src/network/core_utils.rs:196:20: warning: this manual char comparison can be written more succinctly
#      |
#  196 |             .split(|c| c == ':' || c == '-')
#      |                    ^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using an array of `char`: `[':', '-']`
#      |
#      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_pattern_char_comparison
#      = note: `#[warn(clippy::manual_pattern_char_comparison)]` on by default

Error: CLIPPY_WARNING: [#def2]
netavark-1.12.2-build/src/network/vlan.rs:339:26: warning: using `map_err` over `inspect_err`
#      |
#  339 |                         .map_err(|err| {
#      |                          ^^^^^^^
#      |
#      = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#manual_inspect
#      = note: `#[warn(clippy::manual_inspect)]` on by default
#  help: try
#      |
#  339 ~                         .inspect_err(|err| {
#  340 |                             // If there is an error here most likely the name in the netns is already used,
#  ...
#  347 |                                 );
#  348 ~                             };
#      |

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