[feature.test] Update macro values, using new \tsver

Author: jwakely

src/config.tex

@@ -3,7 +3,7 @@
 %% Version numbers
 \newcommand{\docno}{Dxxxx}
 \newcommand{\prevdocno}{N4656}
-\newcommand{\cppver}{201703L}
+\newcommand{\tsver}{201703}
 
 %% Title
 \newcommand{\doctitle}{\Cpp Extensions for Networking}

src/featuretest.tex

@@ -13,8 +13,8 @@
 \topline
 \lhdr{Macro name} & \rhdr{Value} \\
 \capsep
-\tcode{__cpp_lib_experimental_net}  & \tcode{201602}      \\
-\tcode{__cpp_lib_experimental_net_extensible}  & \tcode{201602}      \\
+\tcode{__cpp_lib_experimental_net}  & \tcode{\tsver}      \\
+\tcode{__cpp_lib_experimental_net_extensible}  & \tcode{\tsver}      \\
 \end{floattable}