fix: datasource passed unicode to foreach_execute in py26 (#4232)

- when collecting in py26 env, if the foreach_execute specs depends
  on DatasourceProvider, the provider will be in unicode type and causes
  the followed validate() fail
- this change converted the unicode to string by force for all 'cmd' passed to
  CommandOutputProvider

Signed-off-by: Xiangce Liu <[email protected]>

rh-pre-commit.version: 2.3.1
rh-pre-commit.check-secrets: ENABLED

insights/core/spec_factory.py

@@ -940,7 +940,7 @@ def __init__(self, cmd, provider, save_as=None, context=HostContext,
                  deps=None, split=True, keep_rc=False, timeout=None,
                  inherit_env=None, override_env=None, signum=None, **kwargs):
         deps = deps if deps is not None else []
-        self.cmd = cmd
+        self.cmd = cmd if six.PY3 else str(cmd)
         self.provider = provider
         self.save_as = save_as.strip("/") if save_as else None  # strip as a relative file path
         self.context = context