last argument of function sss_strnlen "size_t *len" is output variable.
We need to increment value of size_t being pointed to by pointer instead of
incrementing pointer.

Removes off by one error when using macro MC_SIZE_TO_SLOTS
and adds new macro MC_SLOT_WITHIN_BOUNDS.

We had pattern in client code with 3 conditions
that can be replaced with one.

data->name value must be checked to prevent segfaults in
case of corrupted memory cache.

resolves:
https://fedorahosted.org/sssd/ticket/2018

This patch prevents jumping outside of allocated memory in
case of corrupted slot or name_ptr values. It is not proper
solution, just hotfix until we find out what is the root cause
of ticket https://fedorahosted.org/sssd/ticket/2018

This patch modifies the PAC responder so that it can be used with the AD
provider as well. The main difference is that the POSIX UIDs and GIDs
are now lookup up with the help of the SID instead of being calculated
algorithmically. This was necessary because the AD provider allows
either algorithmic mapping or reading the value from attributes stored
in AD.

Fixes https://fedorahosted.org/sssd/ticket/1558

https://fedorahosted.org/sssd/ticket/1772

SAFEALIGN macros have been renamed in this patch to
make it easy to pick the right macro when data is copied
from byte buffer to a variable or vice versa.

The renamed macros are placed in new header file to
avoid code duplication (the old ones were defined in
two files, one for the client code and one for the rest
of sssd).

Instead of appending @domain to names when the --domain option of sss_ssh_* is
used, put domain name in a separate field in client requests.

This patch add a library for client side lookups for a SID or with a
SID through the calls:
- sss_nss_getsidbyname
- sss_nss_getsidbyid
- sss_nss_getnamebysid
- sss_nss_getidbysid
The library is called libsss_nss_idmap and the contributed spec file
will create two new packages libsss_nss_idmap and
libsss_nss_idmap-devel.