Filter REST commands by subcategory as well

[fenek]

This PR fixes #2278

Commands in REST weren't filtered by subcategory, so for any two commands with the same method and category but different subcategories, the handler will crash and return 500 error.

Tests that would have detected the problem were for some reason disabled.

[NelsonVides]

👍
PS: CircleCI failure is the unstable test I'm trying to fix right now, we can ignore it.

[mongoose-im]

7036.1 / Erlang 22.0 / small_tests / 87f9172
Reports root / small

---

7036.2 / Erlang 22.0 / internal_mnesia / 87f9172
Reports root/ big
OK: 1261 / Failed: 0 / User-skipped: 175 / Auto-skipped: 0

---

7036.3 / Erlang 22.0 / odbc_mssql_mnesia / 87f9172
Reports root/ big
OK: 3168 / Failed: 0 / User-skipped: 284 / Auto-skipped: 0

---

7036.4 / Erlang 22.0 / mysql_redis / 87f9172
Reports root/ big
OK: 3166 / Failed: 0 / User-skipped: 286 / Auto-skipped: 0

---

7036.7 / Erlang 22.0 / elasticsearch_and_cassandra_mnesia / 87f9172
Reports root/ big
OK: 548 / Failed: 0 / User-skipped: 55 / Auto-skipped: 0

---

7036.6 / Erlang 22.0 / ldap_mnesia / 87f9172
Reports root/ big
OK: 1228 / Failed: 0 / User-skipped: 208 / Auto-skipped: 0

---

7036.5 / Erlang 22.0 / riak_mnesia / 87f9172
Reports root/ big
OK: 1493 / Failed: 0 / User-skipped: 176 / Auto-skipped: 0

---

7036.9 / Erlang 21.3 / pgsql_mnesia / 87f9172
Reports root/ big / small
OK: 3181 / Failed: 0 / User-skipped: 271 / Auto-skipped: 0

[codecov]

Codecov Report

Merging #2426 into master will decrease coverage by 0.38%.
The diff coverage is 40%.

@@            Coverage Diff             @@
##           master    #2426      +/-   ##
==========================================
- Coverage   72.62%   72.23%   -0.39%     
==========================================
  Files         340      340              
  Lines       29392    29392              
==========================================
- Hits        21345    21231     -114     
- Misses       8047     8161     +114

Impacted Files	Coverage Δ
src/mongoose_commands.erl	75.36% <ø> (-1.48%)	⬇️
src/mongoose_api_client.erl	0% <0%> (ø)	⬆️
src/mongoose_api_admin.erl	82.45% <100%> (ø)	⬆️
src/mod_auth_token_rdbms.erl	0% <0%> (-100%)	⬇️
src/inbox/mod_inbox_rdbms_pgsql.erl	0% <0%> (-100%)	⬇️
src/rdbms/mongoose_rdbms_pgsql.erl	0% <0%> (-85.3%)	⬇️
src/mod_auth_token.erl	0% <0%> (-82.84%)	⬇️
src/rdbms/mongoose_rdbms_pgsql_codec_boolean.erl	0% <0%> (-77.78%)	⬇️
src/mod_keystore.erl	0% <0%> (-77.09%)	⬇️
src/mod_keystore_mnesia.erl	0% <0%> (-71.43%)	⬇️
... and 29 more

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