* Add support to process regexp in multiply threads by using thread pool.
* Add support to process regexp in multiply threads by using thread pool.

amohanta/rspamd,dark-al/rspamd,amohanta/rspamd,dark-al/rspamd,andrejzverev/rspamd,amohanta/rspamd,amohanta/rspamd,dark-al/rspamd,amohanta/rspamd,minaevmike/rspamd,andrejzverev/rspamd,awhitesong/rspamd,andrejzverev/rspamd,awhitesong/rspamd,awhitesong/rspamd,minaevmike/rspamd,minaevmike/rspamd,minaevmike/rspamd,dark-al/rspamd,awhitesong/rspamd,minaevmike/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,andrejzverev/rspamd,AlexeySa/rspamd,AlexeySa/rspamd,dark-al/rspamd,minaevmike/rspamd,minaevmike/rspamd,minaevmike/rspamd,andrejzverev/rspamd,AlexeySa/rspamd,andrejzverev/rspamd,AlexeySa/rspamd,andrejzverev/rspamd,AlexeySa/rspamd,andrejzverev/rspamd,AlexeySa/rspamd,minaevmike/rspamd,AlexeySa/rspamd