Allow multiple calls on OCResource::observe().
Allow multiple calls on OCResource::observe().

Remove check against m_observeHandle in OCResource::observe().
This will allow mutliple calls on observe with different query
parameters.

Bug: https://jira.iotivity.org/browse/IOT-1115
Change-Id: I1bae9e8db8999bf6e805eec75ebcbe9f4af8b3c7
Signed-off-by: Ziran Sun <3baa2a3e3c6d96dba4b6f1736d53815847db9a07@samsung.com>
Reviewed-on: https://gerrit.iotivity.org/gerrit/11735
Tested-by: jenkins-iotivity <09cb29e8a2b473a2c978382eec13ee06fa017bda@opendaylight.org>
Reviewed-by: Todd Malsbary <8856a5d8416dae6d0ae52d024d7a973f628fb21e@intel.com>
Reviewed-by: Habib Virji <40be98b50fb6c4d79bd282a617e2cc82e300d47f@samsung.com>

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