rust/shed/hostname: rename hostname dependency to unbreak doctests

Summary: With the update from rustc 1.44 to 1.47 the doctests started to break when building a crate that depends on a different crate of the same name, see this: rust-lang/cargo#6819

Differential Revision: D24390815

fbshipit-source-id: 19b06e7f8d011da8f213c8e82de98d88d1cd0dd4

shed/hostname/Cargo.toml

@@ -8,4 +8,4 @@ include = ["src/**/*.rs"]
 
 [dependencies]
 anyhow = "1.0"
-hostname = "0.3"
+hostname_orig = { package = "hostname", version = "0.3" }

shed/hostname/src/lib.rs

@@ -18,12 +18,12 @@ use anyhow::Result;
 pub fn get_hostname() -> Result<String> {
     #[cfg(not(fbcode_build))]
     {
-        Ok(::hostname::get()?.to_string_lossy().into_owned())
+        Ok(::hostname_orig::get()?.to_string_lossy().into_owned())
     }
 
     #[cfg(fbcode_build)]
     {
-        use hostname as _; // used in oss
+        use hostname_orig as _; // used in oss
 
         fbwhoami::FbWhoAmI::get()?
             .name