locking: Add “__repr__” to SharedLock and PipeCondition
locking: Add “__repr__” to SharedLock and PipeCondition

These help when debugging.

Signed-off-by: Michael Hanselmann <68b67885ff74281219b4a4be33cc20fd45078d7c@google.com>
Reviewed-by: Andrea Spadaccini <92d490849ac1b40cd8e8878e4d94603bebdb089f@google.com>

leshchevds/ganeti,ganeti/ganeti,grnet/snf-ganeti,dimara/ganeti,ganeti/ganeti,andir/ganeti,ganeti-github-testing/ganeti-test-1,apyrgio/ganeti,mbakke/ganeti,ganeti/ganeti,onponomarev/ganeti,ganeti-github-testing/ganeti-test-1,yiannist/ganeti,andir/ganeti,mbakke/ganeti,dimara/ganeti,bitemyapp/ganeti,mbakke/ganeti,yiannist/ganeti,andir/ganeti,leshchevds/ganeti,apyrgio/ganeti,apyrgio/snf-ganeti,onponomarev/ganeti,yiannist/ganeti,apyrgio/snf-ganeti,grnet/snf-ganeti,bitemyapp/ganeti,leshchevds/ganeti