netutils/webclient: check webclient example running status
netutils/webclient: check webclient example running status

This commit addes global value for checking webclieng running status.
If webclient example runs twice at a time, global values like g_https
and g_async can be destroyed by latter webclient app.

Change-Id: I49644810de070c09d10e5d2c4bad402d35e5e505
Signed-off-by: Junyeon LEE <ddc45265127aa1feb4b01be10ec1f0d25d062d3d@samsung.com>

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