When generating providers feature matrix table, sort the regions to achieve a stable output format.
When generating providers feature matrix table, sort the regions to
achieve a stable output format.

pquentin/libcloud,vongazman/libcloud,Scalr/libcloud,pquentin/libcloud,mistio/libcloud,apache/libcloud,Kami/libcloud,ByteInternet/libcloud,andrewsomething/libcloud,andrewsomething/libcloud,erjohnso/libcloud,erjohnso/libcloud,Kami/libcloud,ZuluPro/libcloud,ByteInternet/libcloud,vongazman/libcloud,andrewsomething/libcloud,Scalr/libcloud,mistio/libcloud,vongazman/libcloud,pquentin/libcloud,Kami/libcloud,ZuluPro/libcloud,erjohnso/libcloud,mistio/libcloud,Scalr/libcloud,StackPointCloud/libcloud,apache/libcloud,StackPointCloud/libcloud,ByteInternet/libcloud,StackPointCloud/libcloud,apache/libcloud,ZuluPro/libcloud