Install pid and status directories explicitly

[sebb7]

This PR allows configure to set directories for pid and status files. Their default location for system install is now set to /var/lib/mongooseim.

[mongoose-im]

7880.1 / Erlang 22.0 / small_tests / 01fb5db
Reports root / small

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7880.2 / Erlang 22.0 / internal_mnesia / 01fb5db
Reports root/ big
OK: 1378 / Failed: 0 / User-skipped: 155 / Auto-skipped: 0

---

7880.3 / Erlang 22.0 / odbc_mssql_mnesia / 01fb5db
Reports root/ big
OK: 2613 / Failed: 0 / User-skipped: 200 / Auto-skipped: 0

---

7880.4 / Erlang 22.0 / mysql_redis / 01fb5db
Reports root/ big
OK: 2608 / Failed: 0 / User-skipped: 205 / Auto-skipped: 0

---

7880.7 / Erlang 22.0 / elasticsearch_and_cassandra_mnesia / 01fb5db
Reports root/ big
OK: 328 / Failed: 0 / User-skipped: 28 / Auto-skipped: 0

---

7880.6 / Erlang 22.0 / ldap_mnesia / 01fb5db
Reports root/ big
OK: 1343 / Failed: 0 / User-skipped: 190 / Auto-skipped: 0

---

7880.5 / Erlang 22.0 / riak_mnesia / 01fb5db
Reports root/ big
OK: 1511 / Failed: 0 / User-skipped: 162 / Auto-skipped: 0

---

7880.9 / Erlang 21.3 / pgsql_mnesia / 01fb5db
Reports root/ big / small
OK: 2626 / Failed: 0 / User-skipped: 187 / Auto-skipped: 0

[codecov]

Codecov Report

Merging #2618 into master will decrease coverage by 0.24%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2618      +/-   ##
==========================================
- Coverage   66.87%   66.63%   -0.25%     
==========================================
  Files         355      355              
  Lines       30050    30050              
==========================================
- Hits        20097    20023      -74     
- Misses       9953    10027      +74     

Impacted Files	Coverage Δ
src/mod_vcard_mnesia.erl	31.32% <0.00%> (-50.61%)	⬇️
src/auth/ejabberd_auth_internal.erl	35.71% <0.00%> (-21.43%)	⬇️
src/metrics/mongoose_metrics.erl	73.88% <0.00%> (-6.37%)	⬇️
...bal_distrib/mod_global_distrib_hosts_refresher.erl	75.51% <0.00%> (-2.05%)	⬇️
...c/global_distrib/mod_global_distrib_server_mgr.erl	79.14% <0.00%> (-0.62%)	⬇️
src/mod_muc_log.erl	77.69% <0.00%> (ø)	⬆️
src/global_distrib/mod_global_distrib_receiver.erl	87.35% <0.00%> (+3.44%)	⬆️
...system_metrics/service_mongoose_system_metrics.erl	77.77% <0.00%> (+7.40%)	⬆️

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