Add tests for alphanumerics as bucket name initial character.
Add tests for alphanumerics as bucket name initial character.

Need to do ugly things to get the bucket prefix logic right,
cleanup manually.

This fills the hole in coverage left by
79d54ac071ae3eb55fdeb183b247162a99cf382d.

tv42/s3-tests,Intel-bigdata/s3-tests,Nexenta/s3-tests,timuralp/s3-tests,robbat2/s3-tests,Nexenta/s3-tests,tv42/s3-tests,Intel-bigdata/s3-tests,ceph/s3-tests,Nexenta/s3-tests,tobegit3hub/s3-tests,jmunhoz/s3-tests,piousbox/s3-tests,robbat2/s3-tests,Nexenta/s3-tests,SUSE/s3-tests,andrewgaul/s3-tests,dreamhost/s3-tests,piousbox/s3-tests,SUSE/s3-tests,dreamhost/s3-tests,smithfarm/s3-tests,smithfarm/s3-tests,basho/s3-tests,jmunhoz/s3-tests,tobegit3hub/s3-tests,ceph/s3-tests,andrewgaul/s3-tests,timuralp/s3-tests,basho/s3-tests,piousbox/s3-tests