shared/path-lookup: rename user control dirs to "user.control"

$ diff -u <(old/systemd-analyze --user unit-paths) <(new/systemd-analyze --user unit-paths)|colordiff
--- /proc/self/fd/14	2018-02-08 14:36:34.190046129 +0100
+++ /proc/self/fd/15	2018-02-08 14:36:34.190046129 +0100
@@ -1,5 +1,5 @@
-/home/zbyszek/.config/systemd/system.control
-/run/user/1000/systemd/system.control
+/home/zbyszek/.config/systemd/user.control
+/run/user/1000/systemd/user.control
 /run/user/1000/systemd/transient
 ...

Strictly speaking, online upgrades of user instances through daemon-reexec will
be broken. We can get away with this since
a) reexecs of the user instance are not commonly done, at least package upgrade
   scripts don't do this afawk.
b) cgroups aren't delegateable on cgroupsv1 there's little reason to use "systemctl
   set-property" for --user mode

1 files changed, 2 insertions, 2 deletions

diff --git a/src/shared/path-lookup.c b/src/shared/path-lookup.c
index 426b936510..5f31831c99 100644
--- a/src/shared/path-lookup.c
+++ b/src/shared/path-lookup.c
@@ -420,11 +420,11 @@ static int acquire_control_dirs(UnitFileScope scope, char **persistent, char **r
         }
 
         case UNIT_FILE_USER:
-                r = xdg_user_config_dir(&a, "/systemd/system.control");
+                r = xdg_user_config_dir(&a, "/systemd/user.control");
                 if (r < 0 && r != -ENXIO)
                         return r;
 
-                r = xdg_user_runtime_dir(runtime, "/systemd/system.control");
+                r = xdg_user_runtime_dir(runtime, "/systemd/user.control");
                 if (r < 0) {
                         if (r != -ENXIO)
                                 return r;