perf: Remove shutil from the import tree

bench/app.py

@@ -6,7 +6,6 @@
 import logging
 import os
 import re
-import shutil
 import subprocess
 import sys
 
@@ -89,6 +88,7 @@ def remove_from_excluded_apps_txt(app, bench_path='.'):
 
 def get_app(git_url, branch=None, bench_path='.', skip_assets=False, verbose=False, restart_bench=True, overwrite=False):
 	import requests
+	import shutil
 
 	if not os.path.exists(git_url):
 		if not is_git_url(git_url):
@@ -195,6 +195,7 @@ def install_app(app, bench_path=".", verbose=False, no_cache=False, restart_benc
 
 
 def remove_app(app, bench_path='.'):
+	import shutil
 	from bench.config.common_site_config import get_config
 
 	if app not in get_apps(bench_path):

bench/utils.py

@@ -13,7 +13,6 @@
 import pwd
 import re
 import select
-import shutil
 import site
 import subprocess
 import sys
@@ -261,6 +260,8 @@ def update(pull=False, apps=None, patch=False, build=False, requirements=False,
 
 
 def copy_patches_txt(bench_path):
+	import shutil
+
 	shutil.copy(os.path.join(os.path.dirname(os.path.abspath(__file__)), 'patches', 'patches.txt'),
 		os.path.join(bench_path, 'patches.txt'))
 
@@ -900,6 +901,8 @@ def get_bench_name(bench_path):
 
 
 def setup_fonts():
+	import shutil
+
 	fonts_path = os.path.join('/tmp', 'fonts')
 
 	if os.path.exists('/etc/fonts_backup'):
@@ -972,6 +975,7 @@ def find_benches(directory=None):
 
 
 def migrate_env(python, backup=False):
+	import shutil
 	from six.moves.urllib.parse import urlparse
 	from bench.config.common_site_config import get_config
 	from bench.app import get_apps