OBS: fix up-to-date check for strongswan-epdg

Move the code to transform the version from the git tag to the version
that we can use in debian/changelog to a separate function. Use it not
only when generating the version for debian/changelog, but also when
checking if the current git tag is up-to-date.

Without this patch, it always considers strongswan-epdg outdated:
  strongswan-epdg: building source package (outdated: osmo-epdg-0.1.2 <=> 0.1.2.osmo.epdg in OBS)

Change-Id: I515695d52f5d37b256ef163875417745897e5900
---
M scripts/obs/lib/debian.py
M scripts/obs/update_obs_project.py
2 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/scripts/obs/lib/debian.py b/scripts/obs/lib/debian.py
index 3c0c2a5..585c447 100644
--- a/scripts/obs/lib/debian.py
+++ b/scripts/obs/lib/debian.py
@@ -92,6 +92,14 @@
     return ret
 
 
+def transform_version(version):
+    if "osmo-epdg-" in version:
+        version = f"{version.replace('osmo-epdg-', '', 1)}-osmo-epdg"
+
+    version = version.replace("-", ".")
+    return version
+
+
 def changelog_add_entry_if_needed(project, version):
     """ Adjust the changelog if the version in the changelog is different from
         the given version. """
@@ -113,10 +121,7 @@
         pass
 
     # Debian versions must start with a digit
-    if "osmo-epdg-" in version:
-        version = f"{version.replace('osmo-epdg-', '', 1)}-osmo-epdg"
-
-    version = version.replace("-", ".")
+    version = transform_version(latest_version)
 
     if version_changelog == version:
         return
diff --git a/scripts/obs/update_obs_project.py b/scripts/obs/update_obs_project.py
index 08d789d..0852693 100755
--- a/scripts/obs/update_obs_project.py
+++ b/scripts/obs/update_obs_project.py
@@ -7,6 +7,7 @@
 import traceback
 import lib
 import lib.config
+import lib.debian
 import lib.docker
 import lib.git
 import lib.metapkg
@@ -97,6 +98,7 @@
                     branch_missing_ok=delete)
             else:
                 latest_version = lib.git.get_latest_tag_remote(package)
+                latest_version = lib.debian.transform_version(latest_version)
 
         if latest_version is None:
             if delete and os.path.basename(package) in pkgs_remote:

