Better crash reporting in Xtrabackup

Registered by Raghavendra D Prabhu

Like the bug reported here https://bugs.launchpad.net/percona-xtrabackup/+bug/1182841

it would also be better if xtrabackup support backtraces for better debugging. (currently it is hard to discover the cause of any crash during prepare etc.)

I tried like using --ibbackup="gdb --batch -ex 'run' -ex 'bt' -ex 'quit' --args xtrabackup_55" but this didn't work, something similar will also do: innobackupex --gdb or so.

Note: lp:1182841 may also be merged into this BP if required/suitable.

There is another issue similar to this: https://bugs.launchpad.net/percona-xtrabackup/+bug/766305

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