[osgi.req] Import get_cachedir
All depgenerators code should be in try/except block
Fix "SyntaxWarning: name 'cachedir' is assigned to before global declaration"
Improve file pattern in javadoc.attr
Improve how we handle OSGi provs/reqs

Move more things to common.osgi, or Metadata class. Also presence of
JAR/manifest path in metadata doesn't mean that there must be
provs/reqs for it in properties. This needs to be checked.
Import "traceback" in depgenerators
Improve dealing with cache files
[maven.req] Fix imports
[maven.req] Attempt to simplify it a bit
[test] Fix maven.req tests
[common.osgi] This check shouldn't be needed
Try to read reqs/provs from correct path
[metadata.artifact] Truly return True if artifact is compat artifact
[test] Set RPM_BUILD_ROOT for maven.prov tests
[metadata] Fix condition when to read provs/reqs manually
set/dict comprehensions are not available in python 2.6
Positional argument specifiers cannot be omitted in python 2.6
Check pom dependencies only if xmvn-resolve is installed
[osgi.req] Fix few problems and add first test
[test] Add basic test for osgi.prov