samples: cleanup sample test naming

Cleanup test names and make them suitable for import into test
management system.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

samples/hello_world/sample.yaml

@@ -11,8 +11,8 @@ common:
       regex:
         - "Hello World! (.*)"
 tests:
-  singlethread:
+  sample.helloworld.singlethread:
     extra_args: CONF_FILE=prj_single.conf
     filter: not CONFIG_BT and not CONFIG_GPIO_SCH and ASSERT == 0
-  test:
+  sample.helloworld.multithread:
     tags: samples

samples/philosophers/sample.yaml

@@ -13,26 +13,26 @@ common:
       - ".*THINKING.*"
       - ".*EATING.*"
 tests:
-  test:
+  sample.philosopher:
     tags: samples
-  test_same_prio:
+  sample.philosopher.same_prio:
     extra_args: "-DSAME_PRIO=1"
-  test_static:
+  sample.philosopher.static:
     extra_args: "-DSTATIC_OBJS=1"
-  test_semaphores:
+  sample.philosopher.semaphores:
     extra_args: "-DFORKS=SEMAPHORES"
-  test_stacks:
+  sample.philosopher.stacks:
     extra_args: "-DFORKS=STACKS"
-  test_fifos:
+  sample.philosopher.fifos:
     extra_args: "-DFORKS=FIFOS"
-  test_lifos:
+  sample.philosopher.lifos:
     extra_args: "-DFORKS=LIFOS"
-  test_preempt_only:
+  sample.philosopher.preempt_only:
     extra_configs:
       - CONFIG_NUM_PREEMPT_PRIORITIES=6
       - CONFIG_NUM_COOP_PRIORITIES=0
       - CONFIG_BT=n
-  test_coop_only:
+  sample.philosopher.coop_only:
     extra_configs:
       - CONFIG_NUM_PREEMPT_PRIORITIES=0
       - CONFIG_NUM_COOP_PRIORITIES=6

samples/synchronization/sample.yaml

@@ -3,7 +3,7 @@ sample:
     basic sanity of the kernel.
   name: Synchronization Sample
 tests:
-  test:
+  sample.synchronization:
     build_on_all: true
     tags: apps
     harness: console