Fix compilation error when not using Azure support

This also fixes CI errors.

src/util.rs

@@ -460,6 +460,7 @@ pub trait DateTimeExt {
     fn to_rfc7231(&self) -> String;
 }
 
+#[cfg(feature = "azure")]
 impl<Tz: chrono::TimeZone> DateTimeExt for chrono::DateTime<Tz>
 where
     Tz::Offset: core::fmt::Display,
@@ -560,8 +561,6 @@ pub fn daemonize() -> Result<()> {
 #[cfg(test)]
 mod tests {
     use super::OsStrExt;
-    use crate::util::DateTimeExt;
-    use chrono::{DateTime, NaiveDateTime, Utc};
     use std::ffi::{OsStr, OsString};
 
     #[test]
@@ -591,8 +590,12 @@ mod tests {
         assert_eq!(a.split_prefix("b"), None);
     }
 
+    #[cfg(feature = "azure")]
     #[test]
     fn rfc7231_format() {
+        use crate::util::DateTimeExt;
+        use chrono::{DateTime, NaiveDateTime, Utc};
+
         let time = DateTime::<Utc>::from_utc(NaiveDateTime::from_timestamp(0, 0), Utc);
 
         assert_eq!(time.to_rfc7231(), "Thu, 01 Jan 1970 00:00:00 GMT");