tests: updated names for the tests

Some test cases have the same test case name.
To get rid of it, I decided to change test cases names
contained same names.
Please check my logic, how I give them names.
Usually trying to give name same as a directory folder.
There are still more test cases which necessary to change,
but I will make changes by small steps.

Signed-off-by: Maksim Masalski <maksim.masalski@intel.com>

tests/crypto/tinycrypt_hmac_prng/testcase.yaml

@@ -1,4 +1,4 @@
 tests:
-  crypto.tinycrypt:
+  crypto.tinycrypt.hmac_prng:
     tags: tinycrypt crypto sha256 hmac prng
     platform_whitelist: native_posix

tests/lib/json/testcase.yaml

@@ -1,5 +1,5 @@
 tests:
-  libraries.encoding:
+  libraries.encoding.json:
     filter: not CONFIG_NEWLIB_LIBC
     min_flash: 34
     tags: json

tests/posix/common/testcase.yaml

@@ -4,21 +4,21 @@ common:
   arch_exclude: posix
 
 tests:
-  portability.posix:
+  portability.posix.common:
     platform_exclude: nsim_sem_mpu_stack_guard nsim_em_mpu_stack_guard
     extra_configs:
       - CONFIG_NEWLIB_LIBC=n
-  portability.posix.newlib:
+  portability.posix.common.newlib:
     platform_exclude: nsim_sem_mpu_stack_guard nsim_em_mpu_stack_guard
     filter: TOOLCHAIN_HAS_NEWLIB == 1
     extra_configs:
       - CONFIG_NEWLIB_LIBC=y
-  portability.posix.nsim:
+  portability.posix.common.nsim:
     platform_whitelist: nsim_sem_mpu_stack_guard nsim_em_mpu_stack_guard
     extra_configs:
       - CONFIG_NEWLIB_LIBC=n
       - CONFIG_TEST_HW_STACK_PROTECTION=n
-  portability.posix.newlib.nsim:
+  portability.posix.common.newlib.nsim:
     platform_whitelist: nsim_sem_mpu_stack_guard nsim_em_mpu_stack_guard
     filter: TOOLCHAIN_HAS_NEWLIB == 1
     extra_configs:

tests/posix/fs/testcase.yaml

@@ -3,10 +3,10 @@ common:
   min_ram: 128
   tags: posix filesystem
 tests:
-  portability.posix:
+  portability.posix.fs:
     extra_configs:
       - CONFIG_NEWLIB_LIBC=n
-  portability.posix.newlib:
+  portability.posix.fs.newlib:
     filter: TOOLCHAIN_HAS_NEWLIB == 1
     extra_configs:
       - CONFIG_NEWLIB_LIBC=y

tests/subsys/jwt/testcase.yaml

@@ -1,5 +1,5 @@
 tests:
-  libraries.encoding:
+  libraries.encoding.jwt:
     min_ram: 96
     min_flash: 72
     tags: jwt

tests/unit/base64/testcase.yaml

@@ -1,4 +1,4 @@
 tests:
-  libraries.encoding:
+  libraries.encoding.base64:
     tags: base64
     type: unit