provide ability to enable crashdump in UI

[Pavel Boldin]

JUSTIFICATION:
Over all of the debug abilities found in the Linux Kernel the Crash Dump is of unbeaten value. Given a Crash Dump Linux Kernel Engineer can and will, eventually, find the root cause for the kernel hang or Oops.

It works the following way: whenever main kernel panics, control over the machine is transferred to a preloaded Crash Kernel via kexec mechanism. The Crash Kernel then dumps main kernel memory (either all of it or only important parts, depending on the configuration) and reboots the machine.

REQUIREMENT:
FUEL UI *MUST* provide means for the user to enable crashdumps in one click. Mirantis OpenStack must provide necessary backend support for this ability.

IMPLEMENTATION DETAILS:
1. Linux distributions on which MOS is based have package crashdump that can be installed. However, at least in Ubuntu Trusty, this package is not working after a default installation due to small memory allocated for the crash kernel. This has to be fixed in the MOS-related provisioning code.
2. Fuel UI must provide a necessary configuration interface which essentially should allow user to enable Crash Dumps with one click specifying details when required by user.

[Vitaly Sedelnik (vsedelnik)]

Pavel, this is feature request, not a bug. Please proceed with creating blueprint and/or product jira ticket.