rgw: raise log level of http client headers

rgw: raise log level of http client headers

these messages are especially spammy because the http client's dout
prefix includes the entire request path:

2021-10-12T04:53:39.281+0000 7f66a0ff9700 10 http_client[POST/http://example.com/admin/log?type=data&notify2&source-zone=3a571642-9f5e-46d8-8186-9eca8cc79ac6&rgwx-zonegroup=8f3b29b1-ffc6-4c90-9d0c-9bd258028cd8]receive_http_header
2021-10-12T04:53:39.281+0000 7f66a0ff9700 10 http_client[POST/http://example.com/admin/log?type=data&notify2&source-zone=3a571642-9f5e-46d8-8186-9eca8cc79ac6&rgwx-zonegroup=8f3b29b1-ffc6-4c90-9d0c-9bd258028cd8]received header:HTTP/1.1 501 Not Implemented
2021-10-12T04:53:39.281+0000 7f66a0ff9700 10 http_client[POST/http://example.com/admin/log?type=data&notify2&source-zone=3a571642-9f5e-46d8-8186-9eca8cc79ac6&rgwx-zonegroup=8f3b29b1-ffc6-4c90-9d0c-9bd258028cd8]receive_http_header
2021-10-12T04:53:39.281+0000 7f66a0ff9700 10 http_client[POST/http://example.com/admin/log?type=data&notify2&source-zone=3a571642-9f5e-46d8-8186-9eca8cc79ac6&rgwx-zonegroup=8f3b29b1-ffc6-4c90-9d0c-9bd258028cd8]received header:Content-Length: 108
2021-10-12T04:53:39.281+0000 7f66a0ff9700 10 http_client[POST/http://example.com/admin/log?type=data&notify2&source-zone=3a571642-9f5e-46d8-8186-9eca8cc79ac6&rgwx-zonegroup=8f3b29b1-ffc6-4c90-9d0c-9bd258028cd8]receive_http_header
2021-10-12T04:53:39.281+0000 7f66a0ff9700 10 http_client[POST/http://example.com/admin/log?type=data&notify2&source-zone=3a571642-9f5e-46d8-8186-9eca8cc79ac6&rgwx-zonegroup=8f3b29b1-ffc6-4c90-9d0c-9bd258028cd8]received header:x-amz-request-id: tx00000000000000027e9ba-00616514d3-70a3-east
2021-10-12T04:53:39.281+0000 7f66a0ff9700 10 http_client[POST/http://example.com/admin/log?type=data&notify2&source-zone=3a571642-9f5e-46d8-8186-9eca8cc79ac6&rgwx-zonegroup=8f3b29b1-ffc6-4c90-9d0c-9bd258028cd8]receive_http_header
2021-10-12T04:53:39.281+0000 7f66a0ff9700 10 http_client[POST/http://example.com/admin/log?type=data&notify2&source-zone=3a571642-9f5e-46d8-8186-9eca8cc79ac6&rgwx-zonegroup=8f3b29b1-ffc6-4c90-9d0c-9bd258028cd8]received header:Accept-Ranges: bytes
2021-10-12T04:53:39.281+0000 7f66a0ff9700 10 http_client[POST/http://example.com/admin/log?type=data&notify2&source-zone=3a571642-9f5e-46d8-8186-9eca8cc79ac6&rgwx-zonegroup=8f3b29b1-ffc6-4c90-9d0c-9bd258028cd8]receive_http_header
2021-10-12T04:53:39.281+0000 7f66a0ff9700 10 http_client[POST/http://example.com/admin/log?type=data&notify2&source-zone=3a571642-9f5e-46d8-8186-9eca8cc79ac6&rgwx-zonegroup=8f3b29b1-ffc6-4c90-9d0c-9bd258028cd8]received header:Content-Type: application/json
2021-10-12T04:53:39.281+0000 7f66a0ff9700 10 http_client[POST/http://example.com/admin/log?type=data&notify2&source-zone=3a571642-9f5e-46d8-8186-9eca8cc79ac6&rgwx-zonegroup=8f3b29b1-ffc6-4c90-9d0c-9bd258028cd8]receive_http_header
2021-10-12T04:53:39.281+0000 7f66a0ff9700 10 http_client[POST/http://example.com/admin/log?type=data&notify2&source-zone=3a571642-9f5e-46d8-8186-9eca8cc79ac6&rgwx-zonegroup=8f3b29b1-ffc6-4c90-9d0c-9bd258028cd8]received header:Date: Tue, 12 Oct 2021 04:53:39 GMT
2021-10-12T04:53:39.281+0000 7f66a0ff9700 10 http_client[POST/http://example.com/admin/log?type=data&notify2&source-zone=3a571642-9f5e-46d8-8186-9eca8cc79ac6&rgwx-zonegroup=8f3b29b1-ffc6-4c90-9d0c-9bd258028cd8]receive_http_header

raise to 30 so they're only enabled for super-verbose logging

Signed-off-by: Casey Bodley <cbodley@redhat.com>