Hardcode default access mode to kernelspace
Hardcode default access mode to kernelspace

Hardcode constants.KERNELSPACE as the default access method for
KVM disk templates, rather than allowing a change to the RBD default
access mode to affect all disk templates for KVM.

At some point in the future it might make more sense to have this
value as its own constant, but as it stands it makes little sense:
only one of several disk templates and one of several hypervisors
support an userspace option to begin with.

Signed-off-by: Raffa Santi <6a214b96de92f36f05379f829a80c82d50682e4c@google.com>
Signed-off-by: Thomas Thrainer <98bdeac947eb8ca18146e9ce7f092788ec242cd1@google.com>
Reviewed-by: Thomas Thrainer <98bdeac947eb8ca18146e9ce7f092788ec242cd1@google.com>

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