Title: #790: Lookahead resolving of host names
This is a continuation of issues #3973 and #3974.
If krb5_kdcinfo_lookahead is set to certain limit, then resolving of SRV record is
stopped once we reach that limit.
The krb5_kdcinfo_lookahead option contains two numbers separated by colon (for
example 5:2). First number specifies number of primary servers that we will use and
write to kdc info file. The second number specifies number of backup servers
To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/790/head:pr790
git checkout pr790