Enhance GetHomeDir to accept either names or UIDs
Enhance GetHomeDir to accept either names or UIDs

Currently GetHomeDir accepts UIDs only. Enhance it to accept either a
user name or a user id, to allow for nicer usage.

Reviewed-by: imsnah


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