Remove plugrack_{read,write}_cache().

These have been awaiting an implementation since 2003.

src/common/plugrack.c

@@ -472,16 +472,6 @@ _match_major ( const char *path_name, const char *major_type )
 	return true;
 }
 
-int
-plugrack_read_cache( plugrack_t rack,
-		     const char *cache_file )
-{
-	/* Don't care for now. */
-
-	return SLURM_ERROR;
-}
-
-
 int
 plugrack_purge_idle( plugrack_t rack )
 {
@@ -525,16 +515,6 @@ plugrack_load_all( plugrack_t rack )
 	return SLURM_SUCCESS;
 }
 
-
-int
-plugrack_write_cache( plugrack_t rack,
-		      const char *cache )
-{
-	/* Not implemented. */
-
-	return SLURM_SUCCESS;
-}
-
 plugin_handle_t
 plugrack_use_by_type( plugrack_t rack,
 		      const char *full_type )

src/common/plugrack.h

@@ -122,15 +122,6 @@ int plugrack_set_paranoia( plugrack_t rack,
 int plugrack_read_dir( plugrack_t rack,
 		       const char *dir );
 
-/*
- * Add plugins to the rack by reading the given cache.  Note that plugins
- * may not actually load, but the rack will be made aware of them.
- *
- * NOT CURRENTLY IMPLEMENTED.
- */
-int plugrack_read_cache( plugrack_t rack,
-			 const char *cache );
-
 /*
  * Remove from memory all plugins that are not currently in use by the
  * program.
@@ -146,14 +137,6 @@ int plugrack_purge_idle( plugrack_t rack );
  */
 int plugrack_load_all( plugrack_t rack );
 
-/*
- * Write the current contents of the plugin rack to a file
- * in cache format, suitable to be read later using plugrack_read_cache().
- *
- * Returns a Slurm errno.
- */
-int plugrack_write_cache( plugrack_t rack, const char *cache );
-
 /*
  * Find a plugin in the rack which matches the given minor type,
  * load it if necessary, and return a handle to it.