py-cherrypy: update; add python 3.7; add dependencies

For python 3, update to 18.1.1
For python 2.7, update to last version supported 17.4.1

Tested with both 27 and 37 using the 10 tutorialsa

closes https://trac.macports.org/ticket/58337

python/py-cherrypy/Portfile

@@ -7,8 +7,7 @@ set _name           cherrypy
 set _n              [string index ${_name} 0]
 
 name                py-${_name}
-# 11.1.0 require various jaraco ports not in macports
-version             11.0.0
+version             18.1.1
 categories-append   www
 platforms           darwin
 supported_archs     noarch
@@ -32,17 +31,33 @@ homepage            http://www.cherrypy.org/
 distname            CherryPy-${version}
 master_sites        pypi:${_n}/${_name}/
 
-checksums           rmd160  097cdb2f7be28792abcf1673314c68d1af9edb4b \
-                    sha256  5671f88c8dd8aecaac650761d18f74a2789b88a9337eb7433abe92a5e0be6780
+checksums           rmd160  b615e83b2ed375714b92cfddc10cc1b2c3c285fe \
+                    sha256  6585c19b5e4faffa3613b5bf02c6a27dcc4c69a30d302aba819639a2af6fa48b \
+                    size    683044
 
-python.versions     27 34 35 36
+python.versions     27 34 35 36 37
 
 if {${name} ne ${subport}} {
     conflicts       py${python.version}-cherrypy3
 
     depends_build-append    port:py${python.version}-setuptools \
                             port:py${python.version}-setuptools_scm
-    depends_lib-append      port:py${python.version}-cheroot
+    depends_lib-append      port:py${python.version}-cheroot \
+                            port:py${python.version}-contextlib2 \
+                            port:py${python.version}-portend \
+                            port:py${python.version}-zc-lockfile
+
+    if {${python.version} eq 27} {
+        # Last version that will support python 2.7
+        version             17.4.1
+        revision            0
+        # Need to set distname again for some reason
+        distname            CherryPy-${version}
+
+        checksums           rmd160  dd53082306fd9f65f39da7a8b157df2c2b0b6d71 \
+                            sha256  fba9fd96d0d9d5b4d680f7ec08e0758a7e5005039ee164e7936594ffad3a81ce \
+                            size    684113
+    }
 
     post-destroot {
         xinstall -m 644 -W ${worksrcpath} \