lib/oe/package_manager/sdk: Ensure do_populate_sdk_ext and do_populate_sdk repos don't conflict

The repository indexes updated during do_populate_sdk_ext and do_populate_sdk
can conflcit. Add the missing lockfile calls for deb/ipk and in the rpm case,
ensure different directories are used for the index for the two sdk cases.

(From OE-Core rev: 5e5569c962c9ebc898eeb5044214e95117b190e1)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oe/sdk.py

@@ -85,7 +85,7 @@ class Sdk(object, metaclass=ABCMeta):
             bb.warn("cannot remove SDK dir: %s" % path)
 
 class RpmSdk(Sdk):
-    def __init__(self, d, manifest_dir=None):
+    def __init__(self, d, manifest_dir=None, rpm_workdir="oe-sdk-repo"):
         super(RpmSdk, self).__init__(d, manifest_dir)
 
         self.target_manifest = RpmManifest(d, self.manifest_dir,
@@ -93,10 +93,15 @@ class RpmSdk(Sdk):
         self.host_manifest = RpmManifest(d, self.manifest_dir,
                                          Manifest.MANIFEST_TYPE_SDK_HOST)
 
+        rpm_repo_workdir = "oe-sdk-repo"
+        if "sdk_ext" in d.getVar("BB_RUNTASK"):
+            rpm_repo_workdir = "oe-sdk-ext-repo"
+
         self.target_pm = RpmPM(d,
                                self.sdk_target_sysroot,
                                self.d.getVar('TARGET_VENDOR'),
                                'target',
+                               rpm_repo_workdir=rpm_repo_workdir
                                )
 
         self.host_pm = RpmPM(d,
@@ -104,7 +109,8 @@ class RpmSdk(Sdk):
                              self.d.getVar('SDK_VENDOR'),
                              'host',
                              "SDK_PACKAGE_ARCHS",
-                             "SDK_OS"
+                             "SDK_OS",
+                             rpm_repo_workdir=rpm_repo_workdir
                              )
 
     def _populate_sysroot(self, pm, manifest):