Allow dnssec key algorithm to be specified

Allow dnssec key algorithm to be specified instead of hardcoding HMAC-MD5. The
default value remains HMAC-MD5.
Remove accidental indentation
Choose default dnssec key size from key algorithm
Use dns_infrastructure_key* if present
Empty strings aren't false in Ruby
Set broker hostname environment file
Add v8314 to dynamic linker path when calling rake assets:precompile
Merge pull request #255 from charlessimpson/broker-host-env

Set broker hostname environment file
Merge pull request #256 from charlessimpson/v8314-on-ld-path

Add v8314 to dynamic linker path when calling rake assets:precompile
Merge pull request #243 from charlessimpson/bind-key-algorithm

Allow dnssec key algorithm to be specified
Increase timeouts of some execs

- restorecons that are problematic
- oo-mongo-setup script
Merge pull request #257 from detiber/increaseTimeouts

Increase timeouts of some execs