ceph: do not use curl ca-cert for signed certificates
ceph: do not use curl ca-cert for signed certificates

cURL's ca-cert and Golang TLS config for ca-certs have a different
meaning, it seems that the Golang implementation will always lookup the
local certs first and then proceeds with the specificed cert, if the
system's certs works it will never go to the specificied certificate.
cURL however, does the opposite by strictly checking the specified cert.
If the certificate is signed we don't need to force a specific
certificate, thus by using capath instead we let cURL determine what's
best to validate against.

Signed-off-by: Sébastien Han <62d754cc350e84d3b1c32ae79f976f5348e74a40@redhat.com>

rook/rook,rook/rook,rook/nfs,rook/rook,rook/nfs,rook/rook,rook/nfs,rook/rook