Bug 840039

Description of problem:
With the move erlang R15 some modules don't work due to the use of regexp calls which have been removed from erlang, should be using the newer rc calls with R15. See https://support.process-one.net/browse/EJAB-921. 

Version-Release number of selected component (if applicable):
ejabberd-2.1.11-1.f17

How reproducible:
Install ejabberd and try to create a shared roster group

Steps to Reproduce:
1.Try using ejabberdctl srg_create
2.
3.
  
Actual results:
Problem 'error undef' occurred executing the command.
Stacktrace: [{regexp,split,["Online","\\\\n"],[]},
             {mod_admin_extra,srg_create,5,
                              [{file,"mod_admin_extra.erl"},{line,1016}]},
             {ejabberd_ctl,call_command,3,
                           [{file,"ejabberd_ctl.erl"},{line,292}]},
             {ejabberd_ctl,try_call_command,3,
                           [{file,"ejabberd_ctl.erl"},{line,269}]},
             {ejabberd_ctl,process2,3,[{file,"ejabberd_ctl.erl"},{line,215}]},
             {ejabberd_ctl,process,1,[{file,"ejabberd_ctl.erl"},{line,200}]},
             {rpc,'-handle_call_call/6-fun-0-',5,
                  [{file,"rpc.erl"},{line,203}]}]

Expected results:
working shared roster group

Additional info:
When recompiling via rpmbuild there are errors as produced
mod_ctlextra.erl:459: Warning: regexp:gsub/3: removed in R15; use the re module instead
mod_ctlextra.erl:631: Warning: regexp:first_match/2: removed in R15; use the re module instead
mod_ctlextra.erl:639: Warning: regexp:format_error/1: removed in R15; use the re module instead
mod_ctlextra.erl:643: Warning: regexp:sh_to_awk/1: removed in R15; use the re module instead


mod_admin_extra.erl:732: Warning: regexp:gsub/3: removed in R15; use the re module instead
mod_admin_extra.erl:1016: Warning: regexp:split/2: removed in R15; use the re module instead
mod_admin_extra.erl:1267: Warning: regexp:first_match/2: removed in R15; use the re module instead
mod_admin_extra.erl:1275: Warning: regexp:format_error/1: removed in R15; use the re module instead
mod_admin_extra.erl:1279: Warning: regexp:sh_to_awk/1: removed in R15; use the re module instead