Address Checkstyle violations
Reset StringBuilder instead of creating new ones

This avoids unneeded garbage, especially during XML parsing.  Replaced
with:

find -name \*.java | xargs sed -i 's/^\( *[^ ]*\) = new StringBuilder();$/\1.setLength(0);/'
OpenStack Cinder general cleanup. Prefer ByteSourcePayload.
Prefer Regions to Zones: OpenStack Nova
Prefer Regions to Zones: OpenStack Cinder
Prefer Regions to Zones: OpenStack Trove
Prefer Regions to Zones: Rackspace Cloud Load Balancers
Prefer Regions to Zones: Cloud Servers UK Provider
Prefer Regions to Zones
Region updates
Readded and deprecated *ForZone methods
Additional removal of *For* methods