Minor fixes (#2038)

Fixes a couple of low hanging fruits.

- Fixes #2037 
- `validators-dir` and `secrets-dir` flags don't really need to depend upon each other
- Fixes #2006 and Fixes #1995

common/lighthouse_version/src/lib.rs

@@ -9,7 +9,7 @@ use target_info::Target;
 ///
 /// `Lighthouse/v0.2.0-1419501f2+`
 pub const VERSION: &str = git_version!(
-    args = ["--always", "--dirty=+"],
+    args = ["--always", "--dirty=+", "--abbrev=7"],
     prefix = "Lighthouse/v1.0.3-",
     fallback = "unknown"
 );