* Update certs-from-mozilla.py

Check if ar exists, if not tell the user what to get to prevent issue #7300 also dynamically get certs instead of hardcoded row item #7573 (comment)
changed comment for missing ar exception
updated path and check for openssl

* master: (299 commits)
  Fix error message typo (esp8266#7581)
  Update certs-from-mozilla.py (esp8266#7578)
  Update DigestAuthorization.ino (Simple example update) (esp8266#7579)
  Fix gzip+signed OTA error (esp8266#7577)
  Properly replace toolchain in PlatformIO CI script (esp8266#7580)
  Update certs-from-mozilla.py (esp8266#7573)
  Fixup weird combination of oneline/multi line comments (esp8266#7566)
  Reduce codesize of setOutputPower (esp8266#7572)
  Fix typos in tests
  Force gcc inlining, use same style for getCycleCount as for getCpuFreqMHz.
  Even more concise #if form.
  Inline, fewer LOC, remove redundant definition in cpp.
  Netump Initial commit (esp8266#7527)
  Delete owner field (esp8266#7563)
  Avoid float-double-conversion (esp8266#7559)
  Use direct member initialization instead of ctr initialisation (esp8266#7556)
  Add CI test for eboot build (esp8266#7546)
  getCpuFreqMHz(): fix when F_CPU is not defined (esp8266#7554)
  emulation-on-host makefile update, allowing to pass more options (esp8266#7552)
  add sdk options to "generic esp8285 module" (esp8266#7550)
  ...

* Update certs-from-mozilla.py

Check if ar exists, if not tell the user what to get to prevent issue #7300 also dynamically get certs instead of hardcoded row item esp8266/Arduino#7573 (comment)
changed comment for missing ar exception
updated path and check for openssl