Test exits must propagate

When a test component exits this needs to be caught by a test harness,
therefore the intermediate init needs to exit as well.

tests/libc.dhall

@@ -12,6 +12,7 @@ in    λ ( _
             { test-libc =
                   Genode.Init.Start::{
                   , binary = "test-libc"
+                  , exitPropagate = True
                   , resources = { caps = 200, ram = Genode.units.MiB 400 }
                   , routes = [ Genode.ServiceRoute.parent "Timer" ]
                   , config =

tests/pci.dhall

@@ -12,6 +12,7 @@ in  { config =
               { test-pci =
                   Genode.Init.Start::{
                   , binary = "test-pci"
+                  , exitPropagate = True
                   , resources = { caps = 96, ram = Genode.units.MiB 2 }
                   , routes =
                       [ Genode.ServiceRoute.child "Platform" "platform_drv" ]

tests/signal.dhall

@@ -12,6 +12,7 @@ in  { config =
               { test-signal =
                   Genode.Init.Start::{
                   , binary = "test-signal"
+                  , exitPropagate = True
                   , resources = { caps = 500, ram = Genode.units.MiB 10 }
                   , routes = [ Genode.ServiceRoute.parent "Timer" ]
                   }

tests/solo5/simple.dhall

@@ -10,6 +10,7 @@ in    λ(testBinary : Genode.Prelude.Map.Entry Text Text)
                 { solo5 =
                     Genode.Init.Start::{
                     , binary = testBinary.mapKey
+                    , exitPropagate = True
                     , resources = { caps = 256, ram = Genode.units.MiB 3 }
                     , routes = [ Genode.ServiceRoute.parent "Timer" ]
                     , config =