LUOobCommand: acquire BGL in shared mode
LUOobCommand: acquire BGL in shared mode

Fixed a typo so that now LUOobCommand acquires the BLG in shared mode, as
intended.

Signed-off-by: Bernardo Dal Seno <dcdd79c5479cb9d1329ec01d126f02cb045aa103@google.com>
Reviewed-by: Iustin Pop <acf83a5274f31a43af6b914614365999469c1a31@google.com>

bitemyapp/ganeti,apyrgio/snf-ganeti,grnet/snf-ganeti,mbakke/ganeti,onponomarev/ganeti,grnet/snf-ganeti,leshchevds/ganeti,leshchevds/ganeti,yiannist/ganeti,apyrgio/ganeti,ganeti-github-testing/ganeti-test-1,yiannist/ganeti,mbakke/ganeti,dimara/ganeti,bitemyapp/ganeti,apyrgio/snf-ganeti,ganeti/ganeti,andir/ganeti,dimara/ganeti,mbakke/ganeti,ganeti/ganeti,andir/ganeti,leshchevds/ganeti,ganeti/ganeti,onponomarev/ganeti,ganeti-github-testing/ganeti-test-1,yiannist/ganeti,apyrgio/ganeti,andir/ganeti