Merge: - blocked-services: settings were reset on restart

Close #1624

Squashed commit of the following:

commit eecc91ca1f9d062c27702a9c07da74da673bef05
Merge: ec53dbeb 26f78dcc
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Mon Apr 27 13:15:58 2020 +0300

    Merge remote-tracking branch 'origin/master' into fix-blocked-svcs

commit ec53dbebdc2fbd2ff94f939d2bd8fb07b9dd1bc8
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Mon Apr 27 12:58:50 2020 +0300

    minor

commit 1e3c20ed02151965ebaca55ac4f25a951a772062
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Mon Apr 27 12:53:37 2020 +0300

    - blocked-services: settings were reset on restart

    broken by:
     0789e4b20d
     * refactor: move blocked-services functions to dnsfilter

dnsfilter/dnsfilter.go

@@ -628,6 +628,11 @@ func makeResult(rule rules.Rule, reason Reason) Result {
 	return res
 }
 
+// InitModule() - manually initialize blocked services map
+func InitModule() {
+	initBlockedServices()
+}
+
 // New creates properly initialized DNS Filter that is ready to be used
 func New(c *Config, blockFilters []Filter) *Dnsfilter {
 
@@ -677,8 +682,6 @@ func New(c *Config, blockFilters []Filter) *Dnsfilter {
 	}
 	d.BlockedServices = bsvcs
 
-	initBlockedServices()
-
 	if blockFilters != nil {
 		err := d.initFiltering(nil, blockFilters)
 		if err != nil {