portageq get_repos: fix <eroot> parameter (bug 670082)

Use the @uses_configroot decorator to make portage get_repos
respect the <eroot> parameter, like portage repos_config since
commit 382f4be415394886026ccd5dcd08ca96ecda31fa. Apply the same
fix to master_repositories and master_repos.

Bug: https://bugs.gentoo.org/670082
Signed-off-by: Zac Medico <zmedico@gentoo.org>
diff --git a/bin/portageq b/bin/portageq
index ab22b1c..3be5ab5 100755
--- a/bin/portageq
+++ b/bin/portageq
@@ -836,6 +836,7 @@
 envvar.__doc__ = docstrings['envvar']
 
 
+@uses_configroot
 @uses_eroot
 def get_repos(argv):
 	if len(argv) < 1:
@@ -849,6 +850,7 @@
 get_repos.__doc__ = docstrings['get_repos']
 
 
+@uses_configroot
 @uses_eroot
 def master_repositories(argv):
 	if len(argv) < 2:
@@ -872,6 +874,7 @@
 master_repositories.__doc__ = docstrings['master_repositories']
 
 
+@uses_configroot
 @uses_eroot
 def master_repos(argv):
 	return master_repositories(argv)