Remove unused imports

There are several imports that are not used.  Remove them.

Change-Id: I2ac3be66827bd68d3faedcef7d6bbf30ea01d3f2

color.py

@@ -17,7 +17,6 @@ import os
 import sys
 
 import pager
-from git_config import GitConfig
 
 COLORS = {None     :-1,
           'normal' :-1,

git_refs.py

@@ -14,7 +14,6 @@
 # limitations under the License.
 
 import os
-import sys
 from trace import Trace
 
 HEAD    = 'HEAD'

main.py

@@ -35,7 +35,6 @@ from git_command import git, GitCommand
 from git_config import init_ssh, close_ssh
 from command import InteractiveCommand
 from command import MirrorSafeCommand
-from command import PagedCommand
 from subcmds.version import Version
 from editor import Editor
 from error import DownloadError

manifest_xml.py

@@ -20,7 +20,7 @@ import sys
 import urlparse
 import xml.dom.minidom
 
-from git_config import GitConfig, IsId
+from git_config import GitConfig
 from project import RemoteSpec, Project, MetaProject, R_HEADS, HEAD
 from error import ManifestParseError
 

project.py

@@ -27,10 +27,8 @@ import time
 from color import Coloring
 from git_command import GitCommand
 from git_config import GitConfig, IsId, GetSchemeFromUrl, ID_RE
-from error import DownloadError
-from error import GitError, HookError, ImportError, UploadError
+from error import GitError, HookError, UploadError
 from error import ManifestInvalidRevisionError
-from progress import Progress
 from trace import IsTrace, Trace
 
 from git_refs import GitRefs, HEAD, R_HEADS, R_TAGS, R_PUB, R_M

subcmds/cherry_pick.py

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import sys, re, string, random, os
+import sys, re
 from command import Command
 from git_command import GitCommand
 

subcmds/download.py

@@ -13,7 +13,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-import os
 import re
 import sys
 

subcmds/grep.py

@@ -14,7 +14,6 @@
 # limitations under the License.
 
 import sys
-from optparse import SUPPRESS_HELP
 from color import Coloring
 from command import PagedCommand
 from git_command import git_require, GitCommand

subcmds/rebase.py

@@ -17,8 +17,6 @@ import sys
 
 from command import Command
 from git_command import GitCommand
-from git_refs import GitRefs, HEAD, R_HEADS, R_TAGS, R_PUB, R_M
-from error import GitError
 
 class Rebase(Command):
   common = True