capstan: add script to automate building capstan MPM packages

This patch adds new script - build-capstan-mpm-packages - to help
automate process of creating capstan packages intended to be used
to assemble OSv images out of them. The script is actually a refined version
of the original one from my external project - https://github.com/wkozaczuk/docker_osv_builder.
For details on how to use the script and what it does read
the comments section in the beginning of build-capstan-mpm-packages.
In essence it builds an OSv module or app to export its content
and create corresponding capstan MPM packages placed
under $HOME/.capstan/packages. Requires capstan present.

The script has at least 3 intended usages:
1) help build packages to be uploaded for new release
2) help build packages out of OSV modules and apps
3) eventually help automates testing OSv by using prebuilt test packages
   to composes test images out of them

Finally this patch adds package descriptor files (mpm/package.yaml)
to help drive annotating packages with correct meta information.

Signed-off-by: Waldemar Kozaczuk <[email protected]>

modules/cli/mpm/package.yaml

@@ -0,0 +1,3 @@
+title: OSv Command Line
+require:
+- osv.httpserver-api

modules/empty/mpm/package.yaml

@@ -0,0 +1,2 @@
+name: osv.bootstrap
+title: OSv Bootstrap

modules/golang/mpm/package.yaml

@@ -0,0 +1,2 @@
+name: osv.run-go
+title: Run Golang wrapper

modules/httpserver-api-tests/mpm/package.yaml

@@ -0,0 +1,8 @@
+title: OSv httpserver API tests
+require:
+- osv.openjdk8-zulu-compact3-with-java-beans
+#- osv.openjdk11-zulu
+- osv.run-java
+- osv.jetty
+- osv.httpserver-api
+- osv.libz

modules/httpserver-api/mpm/package.yaml

@@ -0,0 +1 @@
+title: OSv httpserver with APIs (backend)

modules/httpserver-html5-gui/mpm/package.yaml

@@ -0,0 +1,3 @@
+title: OSv HTML5 GUI (frontend)
+require:
+- osv.httpserver-api

modules/java-non-isolated/mpm/package.yaml

@@ -0,0 +1,2 @@
+name: osv.run-java
+title: Run Java wrapper

modules/tests/mpm/package.yaml

@@ -0,0 +1,4 @@
+name: osv.unit-tests
+title: OSv Unit Tests
+require:
+- osv.openjdk8-zulu-compact3-with-java-beans