rename program.log to external.log

[vpodzime]

Now that libblockdev may use DBus for LVM instead of running binaries it may log DBus calls instead of information about spawning processes. Thus external.log is a more appropriate name than program.log.

[dwlehman]

I like it. This will also affect anaconda, right?

[vpodzime]

Unless we want to separate the blivet log from anaconda's log which is probably not a good idea.

[bcl]

I don't think this is the right thing to do. Leave spawned process logs in program.log and put the dbus logs into a new external.log or dbus.log or whatever. I don't really want to see program.log cluttered up with dbus stuff.

[vpodzime]

I don't see a big difference between spawning a process and doing a DBus call. Both are just asking for some actions or data by/from some external/standalone utility/process.