generic.tests.kdump: Add new test case for kdump over ssh

Dumping the vmcore for remote system via ssh.

Signed-off-by: Shuping Cui <scui@redhat.com>
generic.tests.kdump: Make all functions context_aware

This patch makes all functions context_aware.

Signed-off-by: Shuping Cui <scui@redhat.com>
Merge pull request #45 from spcui/kdump_with_ssh

generic.tests.kdump: Add new test case for kdump over ssh