WConfd: run as <prefix>-masterd by default
WConfd: run as <prefix>-masterd by default

Since WConfd is taking over the old masterd role, it is best to have it
run as the old masterd user. A lot of the files (notably config.data and
client.pem) are accessible by masterd-only.

This is really just to ease the transition from masterd to wconfd and
get things working again and should be re-evaluated in the long run.

This fixes issues #952 and #953.

Signed-off-by: Apollon Oikonomopoulos <ed81ed0a45ccd5c8869bda52e38353a6299ee39e@gmail.com>
Signed-off-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>
Reviewed-by: Klaus Aehlig <4ce51de36d9068cd7db2eec1151e0f3f95419008@google.com>

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