utils: make sure hub command is available

[lukaszstolarczuk]

when preparing PR with docs.
It may fail in some near future, since hub package is out of Fedora Rawhide distribution (see: pmem/libpmemobj-cpp#1013 )

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This change is 

[karczex]

Reviewable status: 0 of 1 files reviewed, 1 unresolved discussion (waiting on @lukaszstolarczuk)

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utils/docker/run-doc-update.sh, line 55 at r1 (raw file):

git config --local user.name ${BOT_NAME}
git config --local user.email "${BOT_NAME}@intel.com"
hub config --global hub.protocol https

this change is probably not needed, as you are using hub command before check in line 99, which will fail just after clone anyway.

[lukaszstolarczuk]

quite curious, I've missed that, thanks!