Update debian package versions to use git commits

The Debian packaging has been changed to reflect all the
git commits under the directory, and not just the commits
to the metadata folder.

This ensures that any new code submissions under those
directories will increment the versions.

Note:
 nfv uses GITREVCOUNT because its src_path is 'None'

Test Plan:
 PASS: build-iso and unlock AIO-SX
 PASS: build-pkgs -p nfv
 PASS: build-pkgs -p nova-api-proxy
 PASS: commit a file change under nfv, and rebuild and
     see that the nfv version has increased.
 PASS: commit a file change one directory before nfv, and
    rebuild and see that the nfv version has not increased.

Story: 2010550
Task: 47222

Signed-off-by: Al Bailey <al.bailey@windriver.com>
Change-Id: I06804af6e356174b608b18219b1f1c8176c99375

mtce-guest/debian/meta_data.yaml

@@ -5,3 +5,5 @@ src_path: src
 revision:
   dist: $STX_DIST
   PKG_GITREVCOUNT: true
+  SRC_GITREVCOUNT:
+    SRC_BASE_SRCREV: 20130b3e07c16b048918d6ab799f65f22e978576

nfv/debian/meta_data.yaml

@@ -12,4 +12,6 @@ src_files:
   - nfv-vim
 revision:
   dist: $STX_DIST
-  PKG_GITREVCOUNT: true
+  GITREVCOUNT:
+    BASE_SRCREV: a2d39ebd1f3453aa36bc0b789930be18242f6ed2
+    SRC_DIR: ${MY_REPO}/stx/nfv/nfv

nova-api-proxy/debian/meta_data.yaml

@@ -5,3 +5,5 @@ src_path: nova-api-proxy
 revision:
   dist: $STX_DIST
   PKG_GITREVCOUNT: true
+  SRC_GITREVCOUNT:
+    SRC_BASE_SRCREV: 20130b3e07c16b048918d6ab799f65f22e978576