fuzzing: Add GDB script

Change-Id: Ia9ce297062ac28dcf7f03ee28247cad4411d1b0f

test/fuzzing/.gdbinit

+# Run in RAM - Don't fill my disk!
+set environment XDG_DATA_HOME=/tmp/jami
+set environment XDG_CONFIG_HOME=/tmp/jami
+set environment XDG_CACHE_HOME=/tmp/jami
+
+# Get full backtrace on any error detected
+set environment UBSAN_OPTIONS=print_stacktrace=1:halt_on_error=1
+set environment ASAN_OPTIONS=print_stacktrace=1:halt_on_error=1
+
+# All TLS conversation to out and stop if log level over critical
+set environment SUPERVISOR_TLS_OUT=out
+set environment SUPERVISOR_LOG=CRIT
+
+# Break on any error repport by ASAN or if sanitizer die
+break __asan::ReportGenericError
+break __sanitizer::Die
+
+run