Debug: Provide a way to enable a debug console to the VM

Provide an additional unit file to enable a debug console.
Also provide an additional agent service file variant that
can be used to launch the VM in debug mode.

The console can be attached using

socat STATE_DIR_CONTAINER/console.sock -

Signed-off-by: Manohar Castelino <manohar.r.castelino@intel.com>

Author: mcastelino

Makefile

@@ -29,9 +29,9 @@ HAVE_SYSTEMD := $(shell pkg-config --exists systemd 2>/dev/null && echo 'yes')
 
 ifeq ($(HAVE_SYSTEMD),yes)
 UNIT_DIR := $(shell pkg-config --variable=systemdsystemunitdir systemd)
-UNIT_FILES = clear-containers.service
+UNIT_FILES = clear-containers.service clear-containers-debug.service
 GENERATED_FILES := $(UNIT_FILES)
-UNIT_FILES += clear-containers.target
+UNIT_FILES += clear-containers.target clear-containers-debug.target
 endif
 
 SED = sed