Client install checks for nss_ldap

In order to check presence of nss_ldap or nss-pam-ldapd when installing
client with '--no-sssd' option there was added code into ipa-client-install.
Checking is based on existence of one of nss_ldap configuration files.
This configuration could be in 'etc/ldap.conf', '/etc/nss_ldap.conf' or
'/etc/libnss_ldap.conf'. Optionaly the nss_ldap could cooperate with
pam_ldap module and hence the presence of it is checked by looking for
'pam_ldap.conf' file. Existence of nss-pam-ldapd is checked against
existence of 'nslcd.conf' file. All this checking is done by function
nssldap_exists(). Because both modules are maintained by two different
functions, the function returns tuple containing return code and dictionary
structure - its key is name of target function and value is list of existing
configuration files. Files to check are specified inside the
nssldap_exists() function. nssldap_exists() also returns True if any of
the mandatory files was found, otherwise returns False.

In order to fit the returned values, the functions
configure_{ldap|nslcd}_conf() were slightly modified. They accept one more
parameter which is list of existing files.  They are not checking existence
of above mentioned files anymore.

https://fedorahosted.org/freeipa/ticket/2063

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