Fix compilation errors in crasher.c

-Conditional inclusion of asm.h for kernel > 3.4
-The owner field of proc_dir_entry has been removed from
 kernel ver 2.6.30
-SPIN_LOCK_UNLOCKED is depricated. DEFINE_SPINLOCK is
 available all the way back to 2.6.12, so no need of
 conditional declaration.

Signed-off-by: Sweekar Pinto <sweekar.pinto@oracle.com>
Fix passwordless ssh for network(ssh) dump test

-Force ssh to use kdump's rsa key to run commands remotely
-Some versions of kexec-tools append the date to the vmcore
 file name. So add vmcore* wildcard to the file name.

Signed-off-by: Sweekar Pinto <sweekar.pinto@oracle.com>
Change crashkernel param to 256M@128M

-We always get "crashkernel reservation failed -memory is in use"
 with crashkernel=64M@16M or crashkernel=128M@16M on all of our
 x86 test hardware. Here 256M@128M seems to be the best fit
 based on empirical data.

Signed-off-by: Sweekar Pinto <sweekar.pinto@oracle.com>