Don't use sudo for everything

We are running as root, and will rely on dropping privs via
systemd rather than sudo

tljh/systemd.py

@@ -1,11 +1,6 @@
 """
 Wraps systemctl to install, uninstall, start & stop systemd services.
 
-We use sudo + subprocess calls for everything. This works when we
-are running as root & as normal user (with arbitrary sudo privileges).
-Arbitrary sudo privileges suck, but are better than running the whole
-process as root.
-
 If we use a debian package instead, we can get rid of all this code.
 """
 import subprocess
@@ -19,7 +14,6 @@ def reload_daemon():
     Makes systemd discover new units.
     """
     subprocess.run([
-        'sudo',
         'systemctl',
         'daemon-reload'
     ], check=True)
@@ -30,7 +24,6 @@ def install_unit(name, unit, path='/etc/systemd/system'):
     Install unit wih given name
     """
     subprocess.run([
-        'sudo',
         'tee',
         os.path.join(path, name)
     ], input=unit.encode('utf-8'), check=True)
@@ -41,7 +34,6 @@ def uninstall_unit(name, path='/etc/systemd/system'):
     Uninstall unit with given name
     """
     subprocess.run([
-        'sudo',
         'rm',
         os.path.join(path, name)
     ], check=True)
@@ -52,7 +44,6 @@ def start_service(name):
     Start service with given name.
     """
     subprocess.run([
-        'sudo',
         'systemctl',
         'start',
         name