Add S_IWUSR permission bit for O_CREAT
In Ubuntu haven't tested it elsewhere yet gcc has a global cflagcalled "D_FORTIFY_SOURCE=2" that errs when files are not createdwith explicit user permissions. Since files are O_WRONLY, I addedthe S_IWUSR permission bit.
Fix warning for possibly uninitialized value
Make xsegbd use xseg_reply_info struct
Turn BUG_ON to WARN_ON on xsegbd
add python bindings support to vlmc tool
Fix wrong mapper op
Add debug messages in vlmcd.
Also fix vlmc, vlmc-xseg tool to send snapshot requests to vlmcd
Add volume freeze functionality for certain ops to vlmcd
Fix request resizing in mapper snapshot
add snapshot support to vlmc-xseg tool
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