rgw: Initialize member variables in rgw_sync.h, rgw_rados.h

[amitkumar50]

Fixes the coverity issues:

** 1355581 Uninitialized scalar field

CID 1355581 (#1 of 1): Uninitialized scalar field (UNINIT_CTOR)
2. uninit_member: Non-static class member cur_shard is not initialized in
this constructor nor in any functions that it calls.

** 1356907 Uninitialized scalar field

2. uninit_member: Non-static class member field mtime.tv_sec is not initialized
   in this constructor nor in any functions that it calls.
   CID 1356907 (FreeBSD support. #1 of 1): Uninitialized scalar field (UNINIT_CTOR)
3. uninit_member: Non-static class member field mtime.tv_nsec is not initialized
   in this constructor nor in any functions that it calls

Signed-off-by: Amit Kumar amitkuma@redhat.com

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[mattbenjamin]

if this still applies, seems harmless; coverity

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[cbodley]

jenkins build docs

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[tchaikov]

might want to merge this after nautilus.

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