Support updating preloaded files in a git repository
Support updating preloaded files in a git repository

The commands in otp_build for updating the checked-in preloaded
modules only works in ClearCase.

Add support updating the preloaded files in a git repository as well.

Check the $version_controller variable so that we can have
"otp_build update_preloaded" do different things depending on
whether it is run in a ClearCase view or a git repository.

When run in a git repository, "otp_build update_preloaded" will
update and commit the preloaded modules (to undo the updating of
the preloaded modules, do "git reset --hard HEAD^").

Update the usage text to only show the commands relevant to
the kind of VCS it is being run in.

yangchengjian/otp,dgud/otp,isvilen/otp,stolen/otp,g-andrade/otp,bernardd/otp,enikki/otp,g-andrade/otp,lemenkov/otp,aboroska/otp,bjorng/otp,bsmr-erlang/otp,ferd/otp,hairyhum/otp,ader1990/otp,erlang/otp,lianghaivv/otp,bsmr-erlang/otp,bjorng/otp,electricimp/otp,psyeugenic/otp,beni55/otp,bugs-erlang-org/otp,vic/otp,dumbbell/otp,RaimoNiskanen/otp,hairyhum/otp,enikki/otp,Teino1978-Corp/erlang-otp,RichMorin/otp,isvilen/otp,rlipscombe/otp,beni55/otp,RGafiyatullin/otp,hairyhum/otp,weisslj/otp,massemanet/otp,sammoth-wazoku/otp,theom/otp,bsmr-erlang/otp,msantos/otp,ferd/otp,ahmedshafeeq/otp,derek121/otp,vladdu/otp,uabboli/otp,GinjaNinja32/otp,sdebnath/otp,RoadRunnr/otp,massemanet/otp,sitexa/otp,cnbin/otp,release-project/otp,haguenau/otp,psyeugenic/otp,saleyn/otp,marquisthunder/otp,lianghaivv/otp,matwey/otp,palas/otp,fenollp/otp,enikki/otp,krishnakumar4a4/otp,emacsmirror/erlang,RoadRunnr/otp,aboroska/otp,dumbbell/otp,bjorng/otp,emacsmirror/erlang,jemsbhai/otp,psyeugenic/otp,lhslll/otp,kvakvs/otp,RoadRunnr/otp,potatosalad/otp,potatosalad/otp,psyeugenic/otp,weisslj/otp,basho/otp,lemenkov/otp,jemsbhai/otp,RaimoNiskanen/otp,RoadRunnr/otp,marquisthunder/otp,bjorng/otp,dumbbell/otp,haguenau/otp,johanclaesson/otp,sammoth-wazoku/otp,lhslll/otp,potatosalad/otp,weisslj/otp,gjaldon/otp,lightcyphers/otp,jamesruan/otp,kvakvs/otp,bernardd/otp,lantti/otp,sammoth-wazoku/otp,lightcyphers/otp,lhslll/otp,riverrun/otp,aboroska/otp,bsmr-erlang/otp,benoitc/otp-1,fenollp/otp,dumbbell/otp,vladdu/otp,jemsbhai/otp,getong/otp,bjorng/otp,RichMorin/otp,mujiatong/otp,kvakvs/otp,bugs-erlang-org/otp,goertzenator/otp,lantti/otp,haguenau/otp,fenollp/otp,mujiatong/otp,awetzel/otp,entropiae/otp,RaimoNiskanen/otp,paladim/otp,erlang/otp,dumbbell/otp,beni55/otp,tuncer/otp,RGafiyatullin/otp,legoscia/otp,basho/otp,stolen/otp,paladim/otp,jamesruan/otp,RJ/otp,yangchengjian/otp,lightcyphers/otp,massemanet/otp,dumbbell/otp,ader1990/otp,ahmedshafeeq/otp,Teino1978-Corp/erlang-otp,dgud/otp,stolen/otp,GinjaNinja32/otp,lightcyphers/otp,jamesruan/otp,johanclaesson/otp,RichMorin/otp,aboroska/otp,marquisthunder/otp,paladim/otp,neeraj9/otp,kvakvs/otp,bsmr-erlang/otp,release-project/otp,Teino1978-Corp/erlang-otp,benoitc/otp-1,neeraj9/otp,yangchengjian/otp,erlang/otp,rlipscombe/otp,jemsbhai/otp,RGafiyatullin/otp,schlagert/otp,tuncer/otp,jemsbhai/otp,neeraj9/otp,NOMORECOFFEE/otp,GinjaNinja32/otp,theom/otp,RoadRunnr/otp,tuncer/otp,RJ/otp,hairyhum/otp,goertzenator/otp,riverrun/otp,klarna/otp,riverrun/otp,electricimp/otp,rlipscombe/otp,uabboli/otp,Teino1978-Corp/otp,jj1bdx/otp,potatosalad/otp,jinshana/otp,jj1bdx/otp,g-andrade/otp,jj1bdx/otp,cobusc/otp,vladdu/otp,enikki/otp,bernardd/otp,lianghaivv/otp,ferd/otp,goertzenator/otp,getong/otp,bugs-erlang-org/otp,marquisthunder/otp,bugs-erlang-org/otp,dgud/otp,yangchengjian/otp,mujiatong/otp,ader1990/otp,aboroska/otp,benoitc/otp-1,erlang/otp,stolen/otp,emile/otp,lantti/otp,RJ/otp,jinshana/otp,falkevik/otp,yangchengjian/otp,paulcager/otp,c-rack/otp,getong/otp,NOMORECOFFEE/otp,vinoski/otp,paladim/otp,vic/otp,matwey/otp,jj1bdx/otp,RGafiyatullin/otp,lemenkov/otp,vladdu/otp,potatosalad/otp,basho/otp,getong/otp,rlipscombe/otp,jemsbhai/otp,emacsmirror/erlang,jj1bdx/otp,getong/otp,haguenau/otp,bernardd/otp,emacsmirror/erlang,sdebnath/otp,VincentHHL/otp,johanclaesson/otp,vic/otp,RichMorin/otp,paulcager/otp,johanclaesson/otp,riverrun/otp,mujiatong/otp,electricimp/otp,cobusc/otp,c-rack/otp,theom/otp,NOMORECOFFEE/otp,tuncer/otp,gjaldon/otp,basho/otp,goertzenator/otp,electricimp/otp,goertzenator/otp,RGafiyatullin/otp,bernardd/otp,sammoth-wazoku/otp,jj1bdx/otp,bjorng/otp,g-andrade/otp,schlagert/otp,emacsmirror/erlang,vladdu/otp,rlipscombe/otp,stolen/otp,jinshana/otp,massemanet/otp,fenollp/otp,getong/otp,uabboli/otp,lemenkov/otp,Teino1978-Corp/otp,goertzenator/otp,RJ/otp,kvakvs/otp,entropiae/otp,ahmedshafeeq/otp,mikpe/otp,mujiatong/otp,NOMORECOFFEE/otp,basho/otp,klarna/otp,matwey/otp,haguenau/otp,RichMorin/otp,isvilen/otp,emacsmirror/erlang,saleyn/otp,Teino1978-Corp/erlang-otp,lightcyphers/otp,neeraj9/otp,gjaldon/otp,NOMORECOFFEE/otp,bernardd/otp,rlipscombe/otp,sdebnath/otp,derek121/otp,matwey/otp,jj1bdx/otp,jj1bdx/otp,GinjaNinja32/otp,msantos/otp,theom/otp,Teino1978-Corp/erlang-otp,jj1bdx/otp,klarna/otp,lhslll/otp,entropiae/otp,jj1bdx/otp,saleyn/otp,release-project/otp,uabboli/otp,enikki/otp,jinshana/otp,hairyhum/otp,saleyn/otp,krishnakumar4a4/otp,awetzel/otp,hairyhum/otp,cnbin/otp,emacsmirror/erlang,derek121/otp,VincentHHL/otp,bugs-erlang-org/otp,electricimp/otp,vinoski/otp,vic/otp,vladdu/otp,VincentHHL/otp,vinoski/otp,falkevik/otp,klarna/otp,paladim/otp,psyeugenic/otp,schlagert/otp,awetzel/otp,jinshana/otp,mikpe/otp,vic/otp,schlagert/otp,beni55/otp,palas/otp,jamesruan/otp,vic/otp,weisslj/otp,VincentHHL/otp,lianghaivv/otp,ferd/otp,RaimoNiskanen/otp,krishnakumar4a4/otp,riverrun/otp,goertzenator/otp,cobusc/otp,GinjaNinja32/otp,paulcager/otp,RJ/otp,emile/otp,weisslj/otp,johanclaesson/otp,uabboli/otp,mikpe/otp,Teino1978-Corp/otp,johanclaesson/otp,feno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