[sssd PR#918][comment] Add support for NSS hosts database lookup.

[pbrezina]

URL: https://github.com/SSSD/sssd/pull/918
Title: #918: Add support for NSS hosts database lookup.

pbrezina commented:
"""
* `master`
    * 8a66d6e5a8abc9a89e12a5ef386541193f965b19 - TESTS: Add LDAP resolver target integration tests
    * e980b0f6a0aa2ded35f7cc81d8049eac159319da - PROXY: Add support for iphost enumeration
    * 45dbaddde02ac0c5b1af612ece19933d50c132a4 - AD: Implement iphost cleanup for expired cache entries
    * ae6d042cbb6b8a2bfecc37edeb3a1509796f6846 - LDAP: Implement iphost cleanup for expired cache entries
    * 10d9346afd1a415cb6c624e9134c977bc6aec8f8 - AD: Add support for iphost enumeration
    * 2be80a00cbd2227e828adb510c2d11cd3cfede48 - AD: Setup resolver enumeration tasks
    * 82b808d93ea8ffaea7a89f9196ad87a6f67441a9 - LDAP: Add support for iphost enumeration
    * 8a51bc0df6d9f45d00b561dc3f03373d0527ce96 - LDAP: Setup resolver enumeration tasks
    * 8b96109ffff823766ee5795f76bf17907392f6ee - CACHE_REQ: Add support for enumerating hosts
    * 11cc32e48b5cb70aecbe040b6629482cb497108e - SYSDB: Add support for enumerating hosts
    * bbcd849a4208bb54d83ebdb4b57e35f25b887dd7 - NSS: Add client support for [set|get|end]hostent()
    * 29b27395f39cb64834a054d1477467c045feaee3 - LDAP: Add support for iphost lookups (no enumeration)
    * b8fba016681aabf82eb7739259e323242aa4a8c4 - LDAP: Prepare for iphost lookups
    * 0498591eaeea0ff92e12e26e818fbf660d45c5b2 - AD: Initialize ldap_iphost_* options
    * 6a7775263cec46b577d3d25be2e2086136c7a134 - LDAP: Document new ldap_iphost_* options
    * a61c6d61c39e566eeda38ceceb8fa11831822d51 - LDAP: Initialize ldap_iphost_* options
    * 1402f10046eb830c9fcb591c8898f73dd13ddc95 - AD: Initialize resolver provider
    * 5672d2beb735d35bbf33efc25c48de4f31c33563 - LDAP: Initialize resolver provider
    * 29c583b6450af52fd0b93b526fda67b946d925ba - PROXY: Handle resolver hosts by address requests
    * 00bc7897163a9fed2bc7ba613f36c6b076e6d8c0 - SYSDB: Extend sysdb_store_host() to accept extra attributes
    * bbb7a45dfd16a7eb8e1b56da508a536e520e3bcd - PROXY: Store results from NSS library call into the cache
    * be791978953d0cfec64a08d7da2aae6d44af8e53 - PROXY: Handle resolver hosts by name requests
    * b1fe85eb0034f3aacb549322b4620976f09e39af - PROXY: Register resolver hosts handler method
    * 688e6a6b56966200e530c9e3a6de534e1f763b7e - PROXY: Load resolver NSS library
    * 0ec8bd578b55564182a21b05773c109393c16840 - PROXY: Create a module context to store id and auth contexts
    * b523fb6a03dbf6289159d4fb8b491fe35f1c2693 - UTIL: Allow to specify mandatory and optional symbols when loading nss libs
    * d6d03aafc49615ae1e4e88a692aa893214c3926d - CONFDB: Add a new resolver_timeout to timeout cached resolver entries
    * 6f6900374520b34b25199259731e410be7b7ebf3 - CONFDB: Add new options for resolver provider
    * 2c317ce9fc5a66ef82969baaf1d949fbee5dcd75 - DP: Implement resolver target handler
    * 014cd3a542bbb27d72c160a5c596b6797c6ed46e - TESTS: Add gethostbyname and gethostbyaddr NSS responder tests
    * 55cfacfe33e656840aed8bdb3ca7870a7bdad4dc - NSS: Add gethostbyname and gethostbyaddr support to the NSS responder
    * e931f27dfd3800c3931c6aba7e75e7499b64a913 - NSS: Add client support for hosts (non-enumeration)
    * 6e66e321797e52d7a9ed093683c45c678c9deec5 - CACHE_REQ: Implement ip_host_by_addr and ip_host_by_name plugins
    * dafdd066ef2358ee06796ce5bba8f0b0891c9d64 - CACHE_REQ: Add a data field to store network addresses
    * 1cb209556adad75264802de543f03e08f7058d23 - CACHE_REQ: Rename cache req host by name name plugin used by SSH
    * 469891df69faeceba2084efd8ce421b1ec11103e - RESPONDER: Add sss_dp_resolver_get_send
    * d76d818cb2015c4d5a4b70fac055f99134c5c858 - DP: Add a new filter type, filter by address
    * 99ce117106b9c0d0e0167f1c10f5840a7912fa7f - SBUS: Add new resolver target interface
    * 622849279be17cc9b7b59f81753aa05a0594df47 - SYSDB: Add index for hostAddress attribute
    * 860c457063fedf4c0020e705060b97cd5a80d1a7 - SYSDB: Add sysdb functions for hosts entries
    * d263fa9d643197bf0f3245e06149f7a3dd96f08d - UTIL: Add a function to canonicalize IP addresses
    * 12bd3f96ca101192ddc6b0afb424c183e68989c9 - STAP: Add missing session data provider target

"""

See the full comment at https://github.com/SSSD/sssd/pull/918#issuecomment-595124324