Restore --init calls in tests

tests/common.sh.in

@@ -53,6 +53,7 @@ clearStore() {
     mkdir "$NIX_STORE_DIR"
     rm -rf "$NIX_STATE_DIR"
     mkdir "$NIX_STATE_DIR"
+    nix-store --init
     clearProfiles
 }
 

tests/init.sh

@@ -25,6 +25,9 @@ fsync-metadata = false
 !include nix.conf.extra.not-there
 EOF
 
+# Initialise the database.
+nix-store --init
+
 # Did anything happen?
 test -e "$NIX_STATE_DIR"/db/db.sqlite