erasure-code: str() to avoid + conversion errors

if the value from the yaml file is an int, it must be converted into a
string bevore being concatenated with '='

Signed-off-by: Loic Dachary <loic@dachary.org>
erasure-code: do not prepend 'ceph' to the erasure-code-profile command

When used in the radosgw context, the 'ceph' string must be present but
when used in ceph_manager, the 'ceph' string is already included.

Signed-off-by: Loic Dachary <loic@dachary.org>
erasure-code: fix typo in create_pool argument name

missing _name at the end

Signed-off-by: Loic Dachary <loic@dachary.org>
Merge pull request #277 from dachary/wip-erasure-code-profile

erasure code profile: fix bugs found while testing manually