Move scripts outside of /etc/
Fix HSS connectons on multi-core processors by only having one worker process.

On multi-core processors, Homestead previously spawned one Python process per core. This allowed HTTP connections to be handled faster, but broke HSS connections - each process made its own HSS connection with the same Origin-Host and Origin-Realm. The HSS only acknowledged one of these connections, causing most requests to fail.

This commit forces Homestead to use a single process (and therefore a single HSS connection) in order to fix this.
Merge pull request #88 from Metaswitch/move-scripts

[Reviewer: Matt] Move scripts outside of /etc/
Create bulk-creation files with full read/write/execute permissions.
Merge pull request #89 from Metaswitch/fix-multicore-hss

[Reviewer: Matt] Fix HSS connections on multi-core processors
Merge pull request #90 from Metaswitch/fix-sh-permissions

[Reviewer: Mike] Create bulk-creation files with full read/write/execute permissions.
Merge branch 'dev' into 404-on-hss-failure
Update UTs
Return 403 for unknown APIs to distinguish 'incorrect URL' from 'subscriber not found'