Deb: Bump epoch to supercede 1:10.1.29-6 in Debian

A non-MariaDB.org contributor introduced the epoch 1: in Debian.
There is no way to revert it, so we just need to adapt to it to
ensure no 10.3 installation would downgrade to that version in
Debian/Ubuntu, as 1: is considered higher than any version before.

debian/autobake-deb.sh

@@ -110,7 +110,7 @@ PATCHLEVEL="+maria"
 LOGSTRING="MariaDB build"
 CODENAME="$(lsb_release -sc)"
 
-dch -b -D ${CODENAME} -v "${UPSTREAM}${PATCHLEVEL}~${CODENAME}" "Automatic build with ${LOGSTRING}."
+dch -b -D ${CODENAME} -v "1:${UPSTREAM}${PATCHLEVEL}~${CODENAME}" "Automatic build with ${LOGSTRING}."
 
 echo "Creating package version ${UPSTREAM}${PATCHLEVEL}~${CODENAME} ... "
 

debian/changelog

+mariadb-10.3 (1:10.3.0) unstable; urgency=low
+
+  * Bump epoch to supersede 1:10.1.29-6 in Debian
+
+ -- Otto Kekäläinen <otto@mariadb.org>  Sat, 31 Mar 2018 22:34:34 +0300
+
 mariadb-10.3 (10.3.0) unstable; urgency=low
 
   * Initial release.