Move devlib packages into "general"

The removal of the wheel caching code
(Ia140dc34638d893b92f66d1ba20efd9522c5923b) removed the install of the
"devlib" packages, which was being done with a call in
tools/build_wheels.sh

The idea of "devlibs" and "general" seems to be pretty much the same
thing -- global build requirements.  I have removed the unused devlibs
files, and moved any missing packages into the "general" package
install file.

Change-Id: I8f34a164d6785a122394b42387d4221a7b447ae1
diff --git a/files/rpms/general b/files/rpms/general
index c3f3de8..2a45227 100644
--- a/files/rpms/general
+++ b/files/rpms/general
@@ -10,8 +10,8 @@
 openssl
 openssl-devel # to rebuild pyOpenSSL if needed
 libffi-devel
-libxml2-devel
-libxslt-devel
+libxml2-devel # lxml
+libxslt-devel # lxml
 pkgconfig
 psmisc
 python-devel
@@ -29,3 +29,6 @@
 java-1.8.0-openjdk-headless  # NOPRIME f21,f22
 pyOpenSSL # version in pip uses too much memory
 iptables-services  # NOPRIME f21,f22
+mariadb-devel  # MySQL-python
+postgresql-devel  # psycopg2
+redhat-rpm-config # MySQL-python rhbz-1195207 f21