[ssi] Add --json flag to eoscta_stub

So we can see how bash shell strings are being escaped and what actually
appears in the protocol buffer.

continuousintegration/docker/ctafrontend/cc7/opt/run/bin/ctaeos-mgm.sh

@@ -191,13 +191,13 @@ test -e /usr/lib64/libjemalloc.so.1 && export LD_PRELOAD=/usr/lib64/libjemalloc.
 # for sss authorisation  unix has to be replaced by sss
 
 # Set the worfklow rule for archiving files to tape
-eos attr set sys.workflow.closew.default="bash:shell:cta XrdSecPROTOCOL=${CTA_XrdSecPROTOCOL} XrdSecSSSKT=${CTA_KT} ${CTA_BIN} archive --user <eos::wfe::rusername> --group <eos::wfe::rgroupname> --diskid <eos::wfe::fid> --instance eoscta --srcurl <eos::wfe::turl> --size <eos::wfe::size> --checksumtype <eos::wfe::checksumtype> --checksumvalue <eos::wfe::checksum> --storageclass <eos::wfe::cxattr:CTA_StorageClass> --diskfilepath <eos::wfe::path> --diskfileowner <eos::wfe::username> --diskfilegroup <eos::wfe::groupname> --recoveryblob:base64 <eos::wfe::base64:metadata> --reportURL 'eosQuery://${EOS_INSTANCE}//eos/wfe/passwd?mgm.pcmd=event\&mgm.fid=<eos::wfe::fxid>\&mgm.logid=cta\&mgm.event=archived\&mgm.workflow=default\&mgm.path=/eos/wfe/passwd\&mgm.ruid=0\&mgm.rgid=0' --stderr" ${CTA_WF_DIR}
+eos attr set sys.workflow.closew.default="bash:shell:cta XrdSecPROTOCOL=${CTA_XrdSecPROTOCOL} XrdSecSSSKT=${CTA_KT} ${CTA_BIN} archive --user <eos::wfe::rusername> --group <eos::wfe::rgroupname> --diskid <eos::wfe::fid> --instance eoscta --srcurl <eos::wfe::turl> --size <eos::wfe::size> --checksumtype <eos::wfe::checksumtype> --checksumvalue <eos::wfe::checksum> --storageclass <eos::wfe::cxattr:CTA_StorageClass> --diskfilepath <eos::wfe::path> --diskfileowner <eos::wfe::username> --diskfilegroup <eos::wfe::groupname> --recoveryblob:base64 <eos::wfe::base64:metadata> --reportURL 'eosQuery://${EOS_INSTANCE}//eos/wfe/passwd?mgm.pcmd=event\&mgm.fid=<eos::wfe::fxid>\&mgm.logid=cta\&mgm.event=archived\&mgm.workflow=default\&mgm.path=/eos/wfe/passwd\&mgm.ruid=0\&mgm.rgid=0' --stderr --json" ${CTA_WF_DIR}
 
 # Set the worflow rule for creating tape file replicas in the EOS namespace.
 eos attr set sys.workflow.archived.default="bash:shell:cta eos file tag <eos::wfe::path> +<eos::wfe::cxattr:CTA_TapeFsId>" ${CTA_WF_DIR}
 
 # Set the worfklow rule for retrieving file from tape.
-eos attr set sys.workflow.sync::prepare.default="bash:shell:cta XrdSecPROTOCOL=${CTA_XrdSecPROTOCOL} XrdSecSSSKT=${CTA_KT} ${CTA_BIN} retrieve --user <eos::wfe::rusername> --group <eos::wfe::rgroupname> --id <eos::wfe::fxattr:sys.archiveFileId> --dsturl '<eos::wfe::turl>\&eos.ruid=0\&eos.rgid=0\&eos.injection=1\&eos.workflow=CTA_retrieve' --diskfilepath <eos::wfe::path> --diskfileowner <eos::wfe::username> --diskfilegroup <eos::wfe::groupname> --recoveryblob:base64 <eos::wfe::base64:metadata> --stderr" ${CTA_WF_DIR}
+eos attr set sys.workflow.sync::prepare.default="bash:shell:cta XrdSecPROTOCOL=${CTA_XrdSecPROTOCOL} XrdSecSSSKT=${CTA_KT} ${CTA_BIN} retrieve --user <eos::wfe::rusername> --group <eos::wfe::rgroupname> --id <eos::wfe::fxattr:sys.archiveFileId> --dsturl '<eos::wfe::turl>\&eos.ruid=0\&eos.rgid=0\&eos.injection=1\&eos.workflow=CTA_retrieve' --diskfilepath <eos::wfe::path> --diskfileowner <eos::wfe::username> --diskfilegroup <eos::wfe::groupname> --recoveryblob:base64 <eos::wfe::base64:metadata> --stderr --json" ${CTA_WF_DIR}
 
 # Set the workflow rule for the closew event of the CTA_retrieve workflow.
 # Using the CTA_retrieve workflow will prevent the default workflow from