set API versions back to 0

Roll back the LIBVERSIONs to 0:0:0 -- the bumps so far have been confused and
wrong. Let's start over from scratch with API-current of 0 while we still can.

Rename the mgcp_client debian .install files back to 0 to match the API
version.

Change-Id: I3d81853f811f412b186621c3657bab6af397a980
diff --git a/debian/control b/debian/control
index 2dfeb09..aca5a62 100644
--- a/debian/control
+++ b/debian/control
@@ -34,7 +34,7 @@
 Depends: libosmo-legacy-mgcp0 (= ${binary:Version}), ${misc:Depends}
 Description: libosmo-legacy-mgcp: Osmocom's Media Gateway server library
 
-Package: libosmo-mgcp-client1
+Package: libosmo-mgcp-client0
 Section: libs
 Architecture: any
 Multi-Arch: same
@@ -46,5 +46,5 @@
 Section: libdevel
 Architecture: any
 Multi-Arch: same
-Depends: libosmo-mgcp-client1 (= ${binary:Version}), ${misc:Depends}
+Depends: libosmo-mgcp-client0 (= ${binary:Version}), ${misc:Depends}
 Description: libosmo-mgcp-client: Osmocom's Media Gateway Control Protocol client utilities