If you do the following:

spectre-2:ttp ckd$ rm -rf ~/.m2/
spectre-2:ttp ckd$ mvn clean install

You get this error message:

[INFO] Scanning for projects...
[WARNING] Could not transfer metadata org.opendaylight.odlparent:odlparent:1.4.2-SNAPSHOT/maven-metadata.xml from/to opendaylight-snapshot (${nexusproxy}/repositories/opendaylight.snapshot/): No connector available to access repository opendaylight-snapshot (${nexusproxy}/repositories/opendaylight.snapshot/) of type default using the available factories WagonRepositoryConnectorFactory
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR] The project org.opendaylight.ttp:ttp-parent:0.0.1-SNAPSHOT (/Users/ckd/git-reps/ttp/pom.xml) has 1 error
[ERROR] Non-resolvable parent POM: Could not transfer artifact org.opendaylight.odlparent:odlparent:pom:1.4.2-SNAPSHOT from/to opendaylight-snapshot (${nexusproxy}/repositories/opendaylight.snapshot/): No connector available to access repository opendaylight-snapshot (${nexusproxy}/repositories/opendaylight.snapshot/) of type default using the available factories WagonRepositoryConnectorFactory and 'parent.relativePath' points at wrong local POM @ line 4, column 11 -> [Help 2]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException
[ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/UnresolvableModelException