Drop upstart/systemctl session jobs

We don't use them anymore as we now completely rely on `anbox launch` to
start the session manager. This lets us remove another part which can't
be shipped inside the snap package.

data/anbox.conf.in

-start on started dbus
-
-respawn
-respawn limit 10 5
-
-exec @SNAP_MOUNT_DIR@/anbox session-manager

data/anbox.service.in

-[Unit]
-Description=Anbox session manager
-
-[Service]
-Type=simple
-ExecStart=@SNAP_MOUNT_DIR@/anbox session-manager
-Restart=always
-StartLimitIntervalSec=3
-StartLimitBurst=1
-
-[Install]
-WantedBy=default.target

debian/anbox-common.install

 etc/X11/Xsession.d/68anbox
-usr/share/upstart/sessions/anbox.conf
-usr/lib/systemd/user/anbox.service
-usr/lib/systemd/user/default.target.wants/anbox.service

debian/control

@@ -10,7 +10,7 @@ Vcs-Git: https://github.com/anbox/anbox.git
 
 Package: anbox-common
 Architecture: all
-Depends: ${misc:Depends}, dbus-user-session
+Depends: ${misc:Depends}
 Description: Common files necessary for Anbox
  .
  This package contains necessary things which can't be shipped

debian/rules

@@ -14,8 +14,6 @@ VERSION=$(shell dpkg-parsechangelog -SVersion)
 override_dh_auto_configure:
 
 override_dh_auto_build:
-	cat data/anbox.service.in | sed s:@SNAP_MOUNT_DIR@:/snap/bin:g > data/anbox.service
-	cat data/anbox.conf.in | sed s:@SNAP_MOUNT_DIR@:/snap/bin:g > data/anbox.conf
 
 override_dh_install:
 	VERSION=$(shell dpkg-parsechangelog -SVersion)
@@ -30,13 +28,6 @@ override_dh_install:
 	install -d $(CURDIR)/debian/tmp/etc/modules-load.d
 	install -m 0644 kernel/anbox.conf $(CURDIR)/debian/tmp/etc/modules-load.d
 
-	install -d $(CURDIR)/debian/tmp/usr/lib/systemd/user/default.target.wants
-	install -m 0644 data/anbox.service $(CURDIR)/debian/tmp/usr/lib/systemd/user/
-	ln -sf /usr/lib/systemd/user/anbox.service $(CURDIR)/debian/tmp/usr/lib/systemd/user/default.target.wants/anbox.service
-
-	install -d $(CURDIR)/debian/tmp/usr/share/upstart/sessions/
-	install -m 0644 data/anbox.conf $(CURDIR)/debian/tmp/usr/share/upstart/sessions/
-
 	install -d $(CURDIR)/debian/tmp/etc/X11/Xsession.d
 	install -m 0644 data/xsession.conf $(CURDIR)/debian/tmp/etc/X11/Xsession.d/68anbox