Application Framework: Fix bugs

Application Framework: Fix bugs

Bump to latest bug fixes:
  * Fix crash when no icon is set in the config.xml
  * Fix tiny memory leaks in the binder

af-main:
  * 259d262 wgtpkg-install: Fix SEGV when no icon in config file

af-binder:
  * c98c0d9 coverage: Improve testing
  * 42b655f hello2: Add a binding v2 example
  * 298f697 hello3: Fix a bug
  * 10ac210 afb-api-v3: Fix a bug introduced by 8ca7b69
  * 7491c74 afb-cred: Fix memory leak
  * 44b2477 coverage: Add valgrind diagnostics

Bug-AGL: SPEC-1573

Change-Id: I8843b406502b66ff78c4dabb3fca72d41323bb45
Signed-off-by: José Bollo <jose.bollo@iot.bzh>