Auth method defaults

[chrzaszcz]

Introduce default values for auth methods, so they are easier to test and to find in the code.
The undefined values for LDAP are also included as defaults for consistency.

[codecov]

Codecov Report

Merging #3458 (4813679) into master (38fcb5e) will decrease coverage by 0.01%.
The diff coverage is 95.23%.

@@            Coverage Diff             @@
##           master    #3458      +/-   ##
==========================================
- Coverage   80.78%   80.77%   -0.02%     
==========================================
  Files         415      415              
  Lines       32306    32303       -3     
==========================================
- Hits        26100    26093       -7     
- Misses       6206     6210       +4     

Impacted Files	Coverage Δ
src/auth/ejabberd_auth_external.erl	29.70% <ø> (ø)
src/auth/ejabberd_auth_anonymous.erl	56.25% <50.00%> (ø)
src/auth/ejabberd_auth_dummy.erl	69.56% <100.00%> (-1.27%)	⬇️
src/auth/ejabberd_auth_ldap.erl	70.42% <100.00%> (ø)
src/auth/ejabberd_auth_rdbms.erl	57.22% <100.00%> (ø)
src/auth/ejabberd_auth_riak.erl	77.50% <100.00%> (ø)
src/auth/extauth.erl	62.71% <100.00%> (ø)
src/config/mongoose_config_spec.erl	98.87% <100.00%> (-0.01%)	⬇️
src/elasticsearch/mongoose_elasticsearch.erl	76.92% <0.00%> (-7.70%)	⬇️
src/mam/mod_mam_elasticsearch_arch.erl	85.08% <0.00%> (-1.76%)	⬇️
... and 6 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 38fcb5e...4813679. Read the comment docs.

[mongoose-im]

small_tests_24 / small_tests / 4813679
Reports root / small

---

small_tests_23 / small_tests / 4813679
Reports root / small

---

dynamic_domains_pgsql_mnesia_23 / pgsql_mnesia / 4813679
Reports root/ big
OK: 2725 / Failed: 0 / User-skipped: 186 / Auto-skipped: 0

---

dynamic_domains_pgsql_mnesia_24 / pgsql_mnesia / 4813679
Reports root/ big
OK: 2725 / Failed: 0 / User-skipped: 186 / Auto-skipped: 0

---

dynamic_domains_mysql_redis_24 / mysql_redis / 4813679
Reports root/ big
OK: 2708 / Failed: 0 / User-skipped: 203 / Auto-skipped: 0

---

dynamic_domains_mssql_mnesia_24 / odbc_mssql_mnesia / 4813679
Reports root/ big
OK: 2725 / Failed: 0 / User-skipped: 186 / Auto-skipped: 0

---

ldap_mnesia_23 / ldap_mnesia / 4813679
Reports root/ big
OK: 1500 / Failed: 0 / User-skipped: 386 / Auto-skipped: 0

---

ldap_mnesia_24 / ldap_mnesia / 4813679
Reports root/ big
OK: 1500 / Failed: 0 / User-skipped: 386 / Auto-skipped: 0

---

internal_mnesia_24 / internal_mnesia / 4813679
Reports root/ big
OK: 1585 / Failed: 0 / User-skipped: 301 / Auto-skipped: 0

---

pgsql_mnesia_23 / pgsql_mnesia / 4813679
Reports root/ big
OK: 3112 / Failed: 0 / User-skipped: 195 / Auto-skipped: 0

---

elasticsearch_and_cassandra_24 / elasticsearch_and_cassandra_mnesia / 4813679
Reports root/ big
OK: 1878 / Failed: 0 / User-skipped: 313 / Auto-skipped: 0

---

pgsql_mnesia_24 / pgsql_mnesia / 4813679
Reports root/ big
OK: 3112 / Failed: 0 / User-skipped: 195 / Auto-skipped: 0

---

mysql_redis_24 / mysql_redis / 4813679
Reports root/ big
OK: 3107 / Failed: 0 / User-skipped: 200 / Auto-skipped: 0

---

mssql_mnesia_24 / odbc_mssql_mnesia / 4813679
Reports root/ big
OK: 3112 / Failed: 0 / User-skipped: 195 / Auto-skipped: 0

---

riak_mnesia_24 / riak_mnesia / 4813679
Reports root/ big
OK: 1724 / Failed: 0 / User-skipped: 314 / Auto-skipped: 0

[NelsonVides]

Excellent 👍🏽