Bug 1009024

This bug is created as a clone of upstream ticket:
https://fedorahosted.org/freeipa/ticket/3931

As `ipa-client-install` is using API host-mod command to modify host and add SSH keys, it always fails to add the key if the client is of a newer version than the server (which will be a very common scenario given that server should be more stable than most of the clients):

{{{
# ipa-client-install -p admin -w Secret123 --mkhomedir --enable-dns-updates --force-join --force-ntpd
Discovery was successful!
Hostname: vm-052.example.com
Realm: EXAMPLE.COM
DNS Domain: example.com
IPA Server: vm-086.example.com
BaseDN: dc=example,dc=com

Continue to configure the system with these values? [no]: y
Synchronizing time with KDC...
Successfully retrieved CA cert
    Subject:     CN=Certificate Authority,O=EXAMPLE.COM
    Issuer:      CN=Certificate Authority,O=EXAMPLE.COM
    Valid From:  Mon Sep 09 06:56:05 2013 UTC
    Valid Until: Fri Sep 09 06:56:05 2033 UTC

Enrolled in IPA realm EXAMPLE.COM
Created /etc/ipa/default.conf
New SSSD config will be created
Configured /etc/sssd/sssd.conf
Configured /etc/krb5.conf for IPA realm EXAMPLE.COM
DNS server record set to: vm-052.example.com -> 10.16.78.52

Adding SSH public key from /etc/ssh/ssh_host_rsa_key.pub
Adding SSH public key from /etc/ssh/ssh_host_dsa_key.pub
host_mod: 2.65 client incompatible with 2.49 server at u'https://vm-086.example.com/ipa/xml'

Failed to upload host SSH public keys.
SSSD enabled
Configured /etc/openldap/ldap.conf
NTP enabled
Configured /etc/ssh/ssh_config
Configured /etc/ssh/sshd_config
Client configuration complete.
}}}

We should do just an LDAP modify operation instead.