Tech debt: "except Exception" present in codebase

[Ed Cranford]

We might like to address the instances of "except Exception" in our codebase, opting for more specific exceptions where applicable.

  ~/Openstack/solum $ grep -r except.Exception *
  functionaltests/api/base.py: except Exception:
  solum/api/handlers/pipeline_handler.py: except Exception as missing_exc:
  solum/common/catalog.py: except Exception:
  solum/common/exception.py: except Exception as e:
  solum/common/exception.py: except Exception as excp:
  solum/openstack/common/config/generator.py: except Exception as e:
  solum/openstack/common/config/generator.py: except Exception:
  solum/openstack/common/db/sqlalchemy/session.py: except Exception as e:
  solum/openstack/common/db/sqlalchemy/session.py: except Exception as ex:
  solum/openstack/common/db/sqlalchemy/test_migrations.py: except Exception:
  solum/openstack/common/db/sqlalchemy/utils.py: except Exception:
  solum/openstack/common/excutils.py: except Exception:
  solum/openstack/common/excutils.py: except Exception as exc:
  solum/openstack/common/fileutils.py: except Exception:
  ~/Openstack/solum $

Most of these are in openstack/common so we may need to pass some changes upstream.