rename model module

Author: hawkw

nexus/db-model/src/fm_sitrep.rs renamed to nexus/db-model/src/fm.rs

@@ -89,7 +89,7 @@ mod webhook_rx;
 // for join-based marker trait generation.
 mod deployment;
 mod ereport;
-mod fm_sitrep;
+pub mod fm;
 pub mod nat_entry;
 mod omicron_zone_config;
 mod quota;
@@ -182,7 +182,7 @@ pub use dns::*;
 pub use downstairs::*;
 pub use ereport::*;
 pub use external_ip::*;
-pub use fm_sitrep::*;
+pub use fm::*;
 pub use generation::*;
 pub use identity_provider::*;
 pub use image::*;