dumpstate: move some of the cheaper-to-collect info earlier.

Some of the state gathering commands take time (ping,...).
They give the system a chance to reboot when things are going belly-up.
We now move some of the cheaper ones (dmesg, last_kmsg, /proc/*...)
earlier in the dump.

Change-Id: I9ffc50ef9105a63193072bc34922dc0bc2bfbd38