Generate SIGUSR1 when homestead or homer hangs
Fix start-stop-daemon commands
Fix path
Dump stack on SIGUSR1 and unhandled exceptions
Don't override our own methods
Trigger core files on HSS exceptions
Homer/homestead-specific diags collection
Add keyspace headings to homestead nodetool describering file
Add local_settings.py to the dump
Markups
Merge branch 'master' into sto518
Merge pull request #101 from Metaswitch/sto518

[Reviewer: Rob][From: Alex] Diagnostics code review.