Bug 1889260 - Remove redundant imports from mozdevice. r=webdriver-reviewers,whimboo

Differential Revision: https://phabricator.services.mozilla.com/D206439

testing/mozbase/rust/mozdevice/src/lib.rs

@@ -12,10 +12,8 @@ use log::{debug, info, trace, warn};
 use once_cell::sync::Lazy;
 use regex::Regex;
 use std::collections::BTreeMap;
-use std::convert::TryFrom;
 use std::fs::File;
 use std::io::{self, Read, Write};
-use std::iter::FromIterator;
 use std::net::TcpStream;
 use std::num::{ParseIntError, TryFromIntError};
 use std::path::{Component, Path};