Description of problem:
Current record format in LDAP is less powerful than BIND's. Generally, each
record (not only name) can have own TTL value, see RFC1035
http://tools.ietf.org/html/rfc1035 section 5.1.
We allow only single TTL value per name, so it's not possible to have e.g.
single name with long-term A record and short term LOC record.
IPA LDAP schema should be as powerfull as BIND zone files.

Version-Release number of selected component (if applicable):
2.1.3-9.el6

How reproducible:
Add two records with different same DNS name and different TTL.

Steps to Reproduce:
1. ipa dnsrecord-add --ttl=123 localnet r1 --a-rec=1.2.3.4
2. ipa dnsrecord-add --ttl=555 localnet r1 --txt-rec=TEST

Actual results:
# ipa dnsrecord-add --ttl=123 localnet r1 --a-rec=1.2.3.4
  Record name: r1
  Time to live: 123
  A record: 1.2.3.4
# ipa dnsrecord-add --ttl=555 localnet r1 --txt-rec=TEST
  Record name: r1
  Time to live: 123
  A record: 1.2.3.4
  TXT record: TEST

Expected results:
# ipa dnsrecord-add --ttl=123 localnet r1 --a-rec=1.2.3.4
  Record name: r1
  Time to live: 123
  A record: 1.2.3.4
# ipa dnsrecord-add --ttl=555 localnet r1 --txt-rec=TEST
  Record name: r1
  Time to live: 555
  A record: 1.2.3.4
  TXT record: TEST

Additional info:
Big schema & UI & BIND LDAP plugin change is required.