Only install specific lcov version when required.

Installing lcov 1.14 everywhere turned out to be a problem just as using 1.13 on Ubuntu 19.04 was.

Since we primarily use Ubuntu 18.04 for coverage testing and reporting, we definitely want to make sure that works.  So, revert to using the default packaged lcov except when specified otherwise in VmTest.pm.

PostgreSQL minor version releases are also included since all containers have been rebuilt.

test/container.yaml

@@ -12,10 +12,10 @@
 # - docker login -u pgbackrest
 # - VM=XXX;DATE=YYYYMMDDX;BASE=pgbackrest/test:${VM?}-base;docker tag ${BASE?} ${BASE?}-${DATE?} && docker push ${BASE?}-${DATE?}
 # **********************************************************************************************************************************
-20191012A:
-  f30: 3875f5a0a8ac8aa80746fb5f4a4a71ae7d8b6311
-  co6: 1d27ba40e176accbc9fa9e0dc4020984635dc699
-  co7: a3d54bb1fecc97978d5ec01f4515bbccd6546b32
-  u12: 8f17ee30f3401591c27216447f6819dfc512c9f5
-  u18: 9f504691c36f0b53bc4f94dc1d64ddf5c98119d9
-  u19: 32d78710c7f60872ee4a8b2374d0110e015e2c24
+20191122A:
+  f30: 3a60318c275cdbfa6daa0f2b502a5551562e6db6
+  co6: 63527115fd269dfee74bda70da8a5b0569f94886
+  co7: 0b4c4b953709dc086f95fcc5c8ca45dee1a5eee9
+  u12: 333122fe71a766b78398a1e86bafd1d8703fef1f
+  u18: c4dd9d5586eb67d77dfa6e0b89c5ebf9e27820a4
+  u19: e68f7b969d12c2c43b47a83053a5241092c28524