make some pidfile @warn -> @debug

Author: IanButterworth

src/Pidfile/Pidfile.jl

@@ -147,7 +147,7 @@ Helper function for `open_exclusive` for deciding if a pidfile is stale.
 """
 function stale_pidfile(path::String, stale_age::Real)
     pid, hostname, age = parse_pidfile(path)
-    age < -stale_age && @warn "filesystem time skew detected" path=path
+    age < -stale_age && @debug "filesystem time skew detected" path=path
     if age > stale_age
         if (age > stale_age * 25) || !isvalidpid(hostname, pid)
             return true
@@ -191,7 +191,7 @@ function open_exclusive(path::String;
     if !wait
         if file === nothing && stale_age > 0
             if stale_age > 0 && stale_pidfile(path, stale_age)
-                @warn "attempting to remove probably stale pidfile" path=path
+                @debug "attempting to remove probably stale pidfile" path=path
                 try
                     rm(path)
                 catch ex
@@ -224,7 +224,7 @@ function open_exclusive(path::String;
             # if the file seems stale, try to remove it before attempting again
             # set stale_age to zero so we won't attempt again, even if the attempt fails
             stale_age -= stale_age
-            @warn "attempting to remove probably stale pidfile" path=path
+            @debug "attempting to remove probably stale pidfile" path=path
             try
                 rm(path)
             catch ex