[apache_logparser] carefully import unavailable module 'File::Tail::Multi

this will allow travis checks again

plugins/apache/apache_vhosts/apache_logparser

@@ -45,7 +45,9 @@ local $debug=0;
 my $scan_interval=5; # minutes
 
 # perl modules
-use File::Tail::Multi;
+# "File:Tail:Multi" disappeared from CPAN (somewhen in 2016) - thus it needs
+# to be imported carefully (for travis checks).
+eval 'use File::Tail::Multi; 1;' or die 'Please install File::Tail::Multi';
 use Storable qw(freeze thaw);
 use List::Util qw(min max);
 use IPC::ShareLite ':lock';