Add sed and greadlink to exceptions (#2977)

Anaconda has packages that override at least sed
Greadlink is also a critical executable if present

pyenv.d/rehash/conda.d/default.list

@@ -64,6 +64,8 @@ redis-check-aof
 redis-check-dump
 redis-cli
 redis-server
+# sed
+sed
 # sqlite3
 sqlite3
 # xslt-config
@@ -189,4 +191,5 @@ wc
 who
 whoami
 yes
-# --- end exclusions from coreutils
+# --- end exclusions from coreutils
+greadlink