oe-selftest: import git module only when needed

git module is not included into standard Python
library and therefore causes import errors on the systems
where PythonGit is not installed.

As git module only used in the code implementing --repository
functionality it's better to import git only in the scope
that requires it.

[YOCTO #10821]

(From OE-Core rev: 66be32c1a075201d6ee0e9b9e10b84e6a2ace745)

Signed-off-by: Ed Bartosh <ed.bartosh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/utils/metadata.py

@@ -5,7 +5,6 @@
 # Functions to get metadata from the testing host used
 # for analytics of test results.
 
-from git import Repo, InvalidGitRepositoryError, NoSuchPathError
 from collections import OrderedDict
 from collections.abc import MutableMapping
 from xml.dom.minidom import parseString
@@ -46,6 +45,7 @@ def metadata_from_data_store(d):
 
 def get_layers(layers):
     """ Returns layer name, branch, and revision as OrderedDict. """
+    from git import Repo, InvalidGitRepositoryError, NoSuchPathError
 
     layer_dict = OrderedDict()
     for layer in layers.split():

scripts/oe-selftest

@@ -36,7 +36,6 @@ import re
 import fnmatch
 import collections
 import imp
-import git
 
 sys.path.insert(0, os.path.dirname(os.path.realpath(__file__)) + '/lib')
 import scriptpath
@@ -577,6 +576,7 @@ def main():
         log.info("Finished")
 
         if args.repository:
+            import git
             # Commit tests results to repository
             metadata = metadata_from_bb()
             git_dir = os.path.join(os.getcwd(), 'selftest')