Merge remote-tracking branch 'origin/pr/2765' into development

* origin/pr/2765: (28 commits)
  Add set+get tests
  Consolidate tests for set with/without values
  config.py testing: also test the get command
  Compatibility redirect: add copyright notice
  Compatibility redirect: if python3 is not available, try python
  Fix config.py output when a symbol has acquired or lost a value
  Remove redundant test case
  cmake: update interpreter requirement for the test suite generator
  cmake: fix Python requirement
  Test script for config.py
  Documentation improvements
  Fix "#define ... not found" error when using the default file name
  Fix "--force set" without a value sneaking a None in
  Fix --force requiring an argument
  Fix Config.unset() making the name known
  Also search config.h near the script
  Report an error if switching to Python fails
  Fix 'config.py set' without --force
  Fix encoding errors
  Print help when invoked with no arguments
  ...

include/mbedtls/check_config.h

@@ -45,7 +45,7 @@
 #endif
 
 /* Fix the config here. Not convenient to put an #ifdef _WIN32 in config.h as
- * it would confuse config.pl. */
+ * it would confuse config.py. */
 #if !defined(MBEDTLS_PLATFORM_SNPRINTF_ALT) && \
     !defined(MBEDTLS_PLATFORM_SNPRINTF_MACRO)
 #define MBEDTLS_PLATFORM_SNPRINTF_ALT

include/mbedtls/config.h

@@ -3518,7 +3518,7 @@
  *            on it, and considering stronger message digests instead.
  *
  */
-// #define MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_CERTIFICATES
+//#define MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_CERTIFICATES
 
 /**
  * Allow SHA-1 in the default TLS configuration for TLS 1.2 handshake