slightly rephrase notice shown for insecure repositories

Git-Dch: Ignore

apt-pkg/acquire-item.cc

@@ -153,7 +153,7 @@ static bool MessageInsecureRepository(bool const isError, std::string const &msg
    if (isError)
    {
       _error->Error("%s", msg.c_str());
-      _error->Notice("%s", _("Updating such a repository securely is impossible and therefore disabled by default."));
+      _error->Notice("%s", _("Updating from such a repository can't be done securely, and is therefore disabled by default."));
    }
    else
    {

test/integration/test-apt-get-update-unauth-warning

@@ -34,7 +34,7 @@ Err:2 file:$APTARCHIVE unstable Release
   File not found - ${APTARCHIVE}/dists/unstable/Release (2: No such file or directory)
 Reading package lists...
 E: The repository 'file:$APTARCHIVE unstable Release' does not have a Release file.
-N: Updating such a repository securely is impossible and therefore disabled by default.
+N: Updating from such a repository can't be done securely, and is therefore disabled by default.
 N: See apt-secure(8) manpage for repository creation and user configuration details." aptget update --no-allow-insecure-repositories
 
 # no package foo

test/integration/test-apt-update-failure-propagation

@@ -44,7 +44,7 @@ testsuccessequal "foo:
 pretest
 mv aptarchive/dists/stable aptarchive/dists/stable.good
 testfailuremsg "E: The repository 'https://localhost:${APTHTTPSPORT} stable Release' does not have a Release file.
-N: Updating such a repository securely is impossible and therefore disabled by default.
+N: Updating from such a repository can't be done securely, and is therefore disabled by default.
 N: See apt-secure(8) manpage for repository creation and user configuration details." apt update
 testfailure aptget update --no-allow-insecure-repositories
 testequalor2 "Hit:1 http://localhost:${APTHTTPPORT} sid InRelease
@@ -54,7 +54,7 @@ Err:3 https://localhost:${APTHTTPSPORT} stable Release
   404  Not Found
 Reading package lists...
 E: The repository 'https://localhost:${APTHTTPSPORT} stable Release' does not have a Release file.
-N: Updating such a repository securely is impossible and therefore disabled by default.
+N: Updating from such a repository can't be done securely, and is therefore disabled by default.
 N: See apt-secure(8) manpage for repository creation and user configuration details." "Ign:1 https://localhost:${APTHTTPSPORT} stable InRelease
   404  Not Found
 Err:2 https://localhost:${APTHTTPSPORT} stable Release
@@ -62,7 +62,7 @@ Err:2 https://localhost:${APTHTTPSPORT} stable Release
 Hit:3 http://localhost:${APTHTTPPORT} sid InRelease
 Reading package lists...
 E: The repository 'https://localhost:${APTHTTPSPORT} stable Release' does not have a Release file.
-N: Updating such a repository securely is impossible and therefore disabled by default.
+N: Updating from such a repository can't be done securely, and is therefore disabled by default.
 N: See apt-secure(8) manpage for repository creation and user configuration details." cat rootdir/tmp/testfailure.output
 
 mv aptarchive/dists/stable.good aptarchive/dists/stable

test/integration/test-apt-update-nofallback

@@ -34,7 +34,7 @@ EOF
 assert_update_is_refused_and_last_good_state_used()
 {
     testfailuremsg "E: The repository 'file:${APTARCHIVE} unstable Release' is no longer signed.
-N: Updating such a repository securely is impossible and therefore disabled by default.
+N: Updating from such a repository can't be done securely, and is therefore disabled by default.
 N: See apt-secure(8) manpage for repository creation and user configuration details." aptget update
 
     assert_repo_is_intact