[api] request history logs provide the creation entry again

not an own element in database, we just render the information from request table
[backend] drop slepool hack, the sle people don't want it
[backend] fix publishedpath query for arch packages
[backend] always provide the ssl cert in followup builds
[backend] add BSUtil::xsystem to capture stdout and stderr
[backend] use BSUtil::xsystem in signer and src server
[backend] be more helpful with the error messages
[backend] warn() about sign errors that lead to failed and rebuild
[api] get rid of "removed" operation state for binary tracking

the obsolete tag is enough and we do not want to override existing data
in operation element
[api] check for patchinfos by type, not name
[api] lookup update projects for channel package search
[api][webui] make maintained projects a model

This fixes some database issues. Brought to you from OhgottOhgottOhgott-Releases....